Civil Service Exam Reviewer · Ratio and Proportion · hard
The present ages of a father and his son are in the ratio 5 : 4. 8 years ago, the ratio was 27 : 20. What is the son's present age?
- 35 years
- 28 years
- 20 years
- 36 years
Answer
B. 28 years
Solution
Ages 5k and 4k: (5k − 8)/(4k − 8) = 27/20 → k = 7. Son = 4 × 7 = 28 years.
More Ratio and Proportion questions
- Two numbers are in the ratio 3 : 4. If 6 is added to each, the ratio becomes 18 : 23. What is the larger of the original numbers?
- The ratio of the number of pupils to teachers in a school is 90 : 1. If there are 64 teachers, how many pupils must be added so that the…
- A box has red and blue balls in the ratio 3 : 7. After 10 red balls are removed, the ratio becomes 1 : 4. How many blue balls are in the…
- Two similar rectangles have corresponding sides in the ratio 4 : 7. What is the ratio of their areas?
- A gear with 58 teeth rotating at 200 rpm drives a gear with 50 teeth. How fast does the second gear rotate?
- Liza and Mila share some money in the ratio 4 : 1. Liza receives ₱9,600 more than Mila. How much money was shared?
- The ratio of the number of pupils to teachers in a school is 50 : 1. If there are 48 teachers, how many pupils must be added so that the…
- 7 workers can complete a job in 28 days. After working for 18 days, 5 workers leave. How many more days will the remaining workers need to…
- 6 carpenters can finish a job in 28 days. How many MORE carpenters are needed to finish it in 12 days?
- ₱44,770 is shared among A, B and C such that A : B = 5 : 2 and B : C = 5 : 1. How much does C receive?