Civil Service Exam Reviewer · Ratio and Proportion · hard
The present ages of a father and his son are in the ratio 7 : 4. 5 years ago, the ratio was 44 : 23. What is the son's present age?
- 49 years
- 23 years
- 28 years
- 33 years
Answer
C. 28 years
Solution
Ages 7k and 4k: (7k − 5)/(4k − 5) = 44/23 → k = 7. Son = 4 × 7 = 28 years.
More Ratio and Proportion questions
- The ratio of the number of pupils to teachers in a school is 30 : 1. If there are 40 teachers, how many pupils must be added so that the…
- ₱20,670 is shared among A, B and C such that A : B = 1 : 6 and B : C = 5 : 3. How much does C receive?
- A box has red and blue balls in the ratio 3 : 7. After 11 red balls are removed, the ratio becomes 1 : 28. How many blue balls are in the…
- Two numbers are in the ratio 2 : 3. If 19 is added to each, the ratio becomes 37 : 46. What is the larger of the original numbers?
- The ratio of the number of pupils to teachers in a school is 70 : 1. If there are 35 teachers, how many pupils must be added so that the…
- Alloy X contains gold and copper in the ratio 4 : 3; alloy Y contains them in the ratio 3 : 1. If equal weights of X and Y are melted…
- Two numbers are in the ratio 1 : 7. If 10 is added to each, the ratio becomes 1 : 3. What is the larger of the original numbers?
- The ratio of the number of pupils to teachers in a school is 60 : 1. If there are 32 teachers, how many pupils must be added so that the…
- 12 workers can complete a job in 20 days. After working for 5 days, 9 workers leave. How many more days will the remaining workers need to…
- A box has red and blue balls in the ratio 7 : 3. After 2 red balls are removed, the ratio becomes 47 : 21. How many blue balls are in the…