The ratio of the ages of two friends is 7:8. After 12 years, the ratio becomes 9:10. What are their present ages?
Show answer & explanation
Correct answer: A
Explanation
Present age = 7x and 8x
After 12 years,
(7x + 12) / (8x + 12) = 9 / 10
70x + 120 = 72x + 108
2x = 12
x = 6
Hence, present age = 7x = 7 × 6 = 42 years
And 8x = 8 × 6 = 48 years