Erika is 3 years old. Her father is 35 years old. How old will Erika be when her father is five times her age?
| |
Erika |
Her father |
Difference |
| Before |
3 |
35 |
32 |
| Change |
+ ? |
+ ? |
|
| After |
1 u |
5 u |
4 u |
The difference in the age between Erika and her father remains unchanged.
Difference in their age at first
= 35 - 3
= 32
Difference in their age in the end
= 5 u - 1 u
= 4 u
4 u = 32
1 u = 32 ÷ 4 = 8
Erika's age when her father is five times her age
= 1 u
= 8
Answer(s): 8
