Pre-test Read carefully and choose the letter of the correct answer. 1. The ratio of boys to girls is 43. there are 24 boys, how many are girls? B. 19 C. 16 D. 18 2.3 people can paint a fence in 4 hours, how many people it will take to paint it in 6 hours? A 2 B 5 C 10 D 8 3. in a partitive proportion 2:3 500, what is the value of the bigger number? A 200 B. 300 C. 100 D 400 4 The heart beats 15 times in 10 seconds. How many times does it beat in one minute? A. 7 times B. 8 times C. 9 times D. 10 times Ten workers can assemble nine car engines in 18 days. How many days will it take 15 workers to assemble the same number of engines? А. 12 days 13 days C 14 days o 15 days The ratio of red roses to white roses in a florist shop is 5:2. If there are 588 roses, how many are white? B 168 Ci 420 D 84 Andrea saves Php 45.00 a day. At this rate, how long will she be able to save Php 270.007 3. 5 O 6 0.7 8 Abag of dog food can feod 4 dogs for 10 days. How long will it feed 5 dogs? B 8 C 10 D. 12 А 4 AGUAWEI PTI
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RATIO AND PROPORTION: MCQ
Answers with Step-by-step explanation:
1. The ratio of boys to girls is 4:3. There are 24 boys, how many are girls?
A. 17 B. 19 C. 16 D. 18
Answer: The correct answer is letter D. 18.
Solution:
boys : girls = 4 : 3 :: 24 : X
24 ÷ 4 = 6 x 3 = 18 girls
2. Three people can paint a fence in 4 hours, how many people it will take to paint it in 6 hours?
A. 2 B. 5 C. 10 D. 8
Answer: The correct answer is letter A. 2.
Solution:
original number of people : new number of hours = new number of people : original number of hours
3 : 6 = X : 4
The product of the means equals to the product of the extremes
3 x 4 = 12 ÷ 6 = 2 people
3. In a partitive proportion 2:3 = 500, what is the value of the bigger number?
A. 200 B. 300 C. 100 D. 400
Answer: The correct answer is letter B. 300.
Solution:
2 + 3 = 5
500 ÷ 5 = 100
3 is bigger than 2, so: 3 x 100 = 300.
4. The heart beats 15 times in 10 seconds. How many times does it beat in one minute?
A. 70 times B. 80 times C. 90 times D. 100 times
Answer: The correct answer is letter C. 90 times.
Solution:
1 minute is equivalent to 60 seconds
15 : 10 :: X : 60
60 ÷ 10 = 6 x 15 = 90 times
5. Ten workers can assemble nine car engines in 18 days. How many days will it take 15 workers to assemble the same number of engines?
А. 12 days B. 13 days C. 14 days D. 15 days
Answer: The correct answer is letter A. 12 days.
Solution:
10 x 18 = 180 ÷ 15 = 12 days
6. The ratio of red roses to white roses in a florist shop is 5:2. If there are 588 roses, how many are white?
A. 148 B. 168 C. 420 D. 84
Answer: The correct answer is letter B. 168.
Solution:
588 ÷ (5+2) = 588 ÷ 7 = 84
84 x 2 = 168 white roses
7. Andrea saves Php 45.00 a day. At this rate, how long will she be able to save Php 270.00?
A. 4 B. 5 C. 6 D. 7
Answer: The correct answer is letter C. 6.
Solution:
270 ÷ 45 = 6 days
8. A bag of dog food can feed 4 dogs for 10 days. How long will it feed 5 dogs?
A. 4 B. 8 C. 10 D. 12
Answer: The correct answer is letter B. 8.
Solution:
4 x 10 = 40
40 ÷ 5 = 8 days
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