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Quiz Chapter 4: Ratios, Rates and Proportions

10 questions · Form 1 Mathematics Bab 4: Ratios, Rates and Proportions

Question 1 of 10Score: 0

Express 15 minutes to 1 hour as a ratio in its simplest form.

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. Express 15 minutes to 1 hour as a ratio in its simplest form.

  1. 1 : 4
  2. 15 : 1
  3. 1 : 60
  4. 1 : 15
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Answer: A

Convert 1 hour to minutes: 60 minutes. Ratio = 15 : 60 = 1 : 4.

2. If a : b = 3 : 4 and the sum of a and b is 35, find the value of b.

  1. 20
  2. 15
  3. 25
  4. 10
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Answer: A

Total parts = 3 + 4 = 7 parts = 35 -> 1 part = 5. Value of b = 4 x 5 = 20.

3. If p : q = 2 : 3 and q : r = 6 : 7, find the ratio p : q : r.

  1. 4 : 6 : 7
  2. 2 : 6 : 7
  3. 4 : 3 : 7
  4. 2 : 3 : 7
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Answer: A

Equalise q: p : q = 4 : 6 and q : r = 6 : 7. Thus, p : q : r = 4 : 6 : 7.

4. Find the ratio of 200 cm to 5 m in simplest form.

  1. 2 : 5
  2. 1 : 25
  3. 4 : 1
  4. 20 : 5
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Answer: A

Convert 5 m to cm: 500 cm. Ratio = 200 : 500 = 2 : 5.

5. Which of the following is a rate?

  1. RM5 per kilogram
  2. 3 : 7
  3. 25%
  4. 4 metres out of 10 metres
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Answer: A

RM5 per kilogram compares two different quantities (money and mass) with different units, which defines a rate.

6. Express 45% as a ratio in its simplest form.

  1. 9 : 20
  2. 9 : 10
  3. 45 : 100
  4. 9 : 25
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Answer: A

45% = 45100 = 920 -> 9 : 20.

7. Which of the following ratios is equivalent to 3 : 5?

  1. 12 : 20
  2. 9 : 20
  3. 6 : 15
  4. 15 : 20
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Answer: A

Multiply both terms by 4: 3 x 4 = 12 and 5 x 4 = 20. Thus, 3 : 5 = 12 : 20.

8. A car travels 180 km in 2 hours. What is its average speed in km/h?

  1. 90 km/h
  2. 360 km/h
  3. 45 km/h
  4. 80 km/h
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Answer: A

Speed = Distance / Time = 180 km / 2 h = 90 km/h.

9. The ratio of angles in a triangle is 1 : 2 : 3. What is the measure of the largest angle?

  1. 90°
  2. 60°
  3. 120°
  4. 30°
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Answer: A

Total ratio parts = 1 + 2 + 3 = 6 parts = 180°. 1 part = 30°. Largest angle = 3 parts = 3 x 30° = 90°.

10. If 8 identical books cost RM96, how much do 5 of these books cost?

  1. RM60
  2. RM40
  3. RM48
  4. RM72
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Answer: A

Cost of 1 book = 968 = RM12. Cost of 5 books = 5 x 12 = RM60.

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