The age of Charlie is
35 of Eric's age. 15 years later, the ratio of Charlie's age to Eric's age is 4 : 5. How old is Eric at first?
| |
Charlie |
Eric |
Difference |
| Before |
3 u |
5 u |
2 u |
| Change |
+ 15 |
+ 15 |
|
| After |
4x2 =
8 u |
5x2 =
10 u |
1x2 =
2 u |
The difference in the age between Charlie and Eric at first and in the end remains unchanged. Make the difference in the age between Charlie and Eric the same. LCM of 2 and 1 is 2.
Increase in Charlie's age
= 8 u - 3 u
= 5 u
5 u = 15
1 u = 15 ÷ 5 = 3
Eric's age at first
= 5 u
= 5 x 3
= 15
Answer(s): 15
