Three numbers are in the ratio 3 : 6 : 9 and their average is 66. What is the largest number?

Question

The present ages of A,B and C are in proportions 4:5:6. Eight years ago, the sum of their ages was 66. What is the sum of present age of A and C?

Solve this without paper and pen?

Answer 1

99

---

Numbers are 3x, 6x and 9x
Their average is
(3x+6x+9x)/3=66
6x=66
x= 11
The largest number is
9x= 9*11= 99

Answer 2

the largest number is 99
Solution,
x + 2x + 3x / 3 = 66, then x= 33
33 x 3 = 99