Valen is 3 years old now. His cousin is 12 years older than him. How old will Valen be when his age is
79 of his cousin's age?
|
Valen |
His cousin |
Difference |
Before |
|
|
12 |
Change |
+ ? |
+ ? |
|
After |
7 u |
9 u |
2 u |
The difference in the age between Valen and his cousin at first and in the end remains unchanged.
Number of years that his cousin is older than Valen
= 9 u - 7 u
= 2 u
2 u = 12
1 u = 12 ÷ 2 = 6
Valen's age when his age is
79 of his cousin's age
= 7 u
= 7 x 6
= 42
Answer(s): 42