Abi is 3 years old. Her father is 31 years old. How old will Abi be when her father is five times her age?
| |
Abi |
Her father |
Difference |
| Before |
3 |
31 |
28 |
| Change |
+ ? |
+ ? |
|
| After |
1 u |
5 u |
4 u |
The difference in the age between Abi and her father remains unchanged.
Difference in their age at first
= 31 - 3
= 28
Difference in their age in the end
= 5 u - 1 u
= 4 u
4 u = 28
1 u = 28 ÷ 4 = 7
Abi's age when her father is five times her age
= 1 u
= 7
Answer(s): 7
