20110701 Chapter 9: Concluding Activity - Viva voce (a Practice)

Each member in the class has been assigned a letter: A, B, C, D and E

You have been assigned to attempt the question your number has been assigned to:

Revision Exercise 9 (page 21-22_

Question 2 - attempted by those who have been assigned A

Question 4 - attempted by those who have been assigned B

Question 6 - attempted by those who have been assigned C

Question 8 - attempted by those who have been assigned D

Question 10 - attempted by those who have been assigned E

You shall do the following:

1. Attempt the question in your notebook - work out the solution clearly
2. Using Quicktime Player or PhotoBooth, record your explanation of the solution as a video clip. 
• Here are some examples/ suggestions:  Example 1, Example 2, Example 3
3. You may upload your video clip into Youtube before embedding it in a Post in the Maths Blog.
4. In the Maths blog
• Title: (Viva Voce) Chap 9 Exercise 9 Question {2, 4, 6, 8 or 10}
• Embed the video clip
• You may include a 'brief' write-up of the steps/ solutions
• Add "Label": viva, Chap9
5. Complete the posting before the next lesson. We will discuss the rubric and give peer feedback in the next lesson. 

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Question 2:
Car X travels 60 km in 45 minutes. Car Y travels 72 km in 1 h 20 min. Find
(a) The average speed of car X
(b) The average speed of car Y
(c) The ratio of average speeds of cars X and Y

Question 4:
Alcohol and water are mixed in the ratio 1:4 by volume. If the volume of the solution is 600cm^3
(a) Find the volume of alcohol in the solution
(b) Find the volume of water in the solution
(c) how much alcohol must be added to the solution so that the ratio of alcohol to water in the solution becomes 1:3 by volume?

Question 6:
(a) Simplify each of the following ratios
(i) a : b = 1 1/2 : 2 2/5 (ii) b : c = 0.105 : 0.350
(b) Find the ratio a : b : c using the data in (a)
(c) Alan, Bob and Cathy share $500 in the ratio a : b : c found in (b). Find Alan's share correct to 2 decimal places.

Question 8:
A man took 4 1/2 hours to drive 360 km from Singapore to Kuala Lumpur. He used 37.5 litres of petrol for the entire journey.
(a) Find his average speed.
(b) Find the petrol consumption rate in km/l
(c) He drove an average speed of 110 km/h on a highway for 2 hours during his journey. Find his average speed for the remaining part of his journey.

Question 10:
Towns P and Q are 120 km apart. Mr Tan drove from P to Q and was scheduled to reach Q after 2 hours. His average speed was 54 km/h for the first 40 minutes.
(a) What was his average speed for the remaining journey if he managed to arrive just on time?
(b) The time taken for his return journey is 2 hours and 10 minutes. Find his average speed for
(i) the return journey (ii) the whole trip

Viva Voce - by Darryl

(Viva Voce) Chap 9 Exercise 9 Question {8}

Viva Voce - from Ming Yi

Viva Voce - from Cowan

(Viva Voce) Chap 9 Exercise 9 Question {10}

Viva voce (by Kashyap) Question ?

Viva voce (by Ben Ng) Question ?

(Viva Voce) Chap 9 Exercise 9 Question-6

http://www.youtube.com/watch?v=4eySYg3fDHI

(Viva Voce) Chap 9 Exercise 9 Question-6

1st: Change A:B from fraction to decimal.
2nd: time to side of B, then to A & C too
3rd: bring up to whole numbers by multiplying by 10,000
4th: Bring down to simpler numbers by dividing by 105
5th: PART A ANSWER!! :D
6th: Add up the numbers for each A:B:C
7th Take $500 divided by that number which is 119, $500/119
8th: Take answer multiplying it by 15.
9th: Answer bring to 2 decimal places.
10th: PART B ANSWER!! :D

(Viva Voce) Chap 9 Exercise 9 Question 4.

Question 4:
Alcohol and water are mixed in a ration 1:4 by volume. If the volume of the solution is 600cm^3,
(a) find the volume of alcohol in the solution,
(b) find the volume of water in the solution,
(c) how much alcohol must be added to the solution so that the ratio of alcohol to water in the solution becomes 1:3 in volume?

(Viva Voce) Chap 9 Exercise 9 Question 2.

Question 2:
Car X travels 60 km in 45 minutes. Car Y travels 72 km in 1 h 20 min. Find
(a) The average speed of car X
(b) The average speed of car Y
(c) The ratio of average speeds of cars X and Y

(Viva Voce) Chap 9 Exercise 9 Question 4

Question 4: 

Alcohol and water are mixed in the ratio 1:4 by volume. If the volume of the solution is 600cm^3
(a) Find the volume of alcohol in the solution
(b) Find the volume of water in the solution
(c) how much alcohol must be added to the solution so that the ratio of alcohol to water in the solution becomes 1:3 by volume?

Sorry for the stuttering, i could not really see the writing while looking sideways at it

(Viva Voce) Chap 9 Exercise 9 Question 8

Question 8:
A man took four and a half hours to drive three hundred and sixty kilometers from Singapore to Kuala Lumpur. He used thirty seven point five liters of petrol for the entire journey.
Watch video here

(Viva Voce) Chap 9 Exercise 9 Question 10

Question 10:
Towns P and Q are 120 km apart. Mr Tan drove from P to Q and was scheduled to reach Q after 2 hours. His average speed was 54 km/h for the first 40 minutes.
(a) What was his average speed for the remaining journey if he managed to arrive just on time?
(b) The time taken for his return journey is 2 hours and 10 minutes. Find his average speed for
(i) the return journey (ii) the whole trip

(Viva Voce) Chap 9 Exercise 9 Question 10

Q 10. Towns P and Q are 120km apart. Mr tan drove from P to Q and was scheduled to reach Q after 2 hours. His average speed was 54km/h for the first 40 minutes.

a)What was his average speed for he remaining journey if he managed to arrive just on time?

b) The time taken for his return journey is 2 hour and 10 minutes. Find the average speed for

i)The return journey. ii)the whole trip.

(Viva Voce) Chap 9 Exercise 9 Question 2

Question 2:
Car X travels 60 km in 45 minutes. Car Y travels 72 km in 1 h 20 min. Find
(a) The average speed of car X
(b) The average speed of car Y
(c) The ratio of average speeds of cars X and Y

(Viva Voce) Chap 9 Exercise 9 Question 10

Towns P and Q are 120km apart. Mr Tan drove from P to Q and was scheduled to reach Q after 2 hours. His average speed was 54km/h for the first 40 minutes
(a) What was his average speed for the remaining journey if he managed to arrive just on time?
(b) The time taken for his return journey is 2 hours 10 minutes. Find his average speed for
(i) the return journey
(ii) the whole trip

Kinda had to rush a bit to meet the time limit. Sorry about that.

(Viva Voce) Chap 9 Exercise 9 Question 6

Question 6:
(a) Simplify each of the following ratios
(i) a : b = 1 1/2 : 2 2/5 (ii) b : c = 0.105 : 0.350
(b) Find the ratio a : b : c using the data in (a)
(c) Alan, Bob and Cathy share $500 in the ratio a : b : c found in (b). Find Alan's share correct to 2 decimal places.

Maths 1B Textbook Q4 (Amelia)

 Question 4:

Alcohol and water are mixed in the ratio 1:4 by volume. If the volume of the solution is 600cm^3

(a) Find the volume of alcohol in the solution

(b) Find the volume of water in the solution

(c) how much alcohol must be added to the solution so that the ratio of alcohol to water in the solution becomes 1:3 by volume?