Perry is 30 years older than his child. 3 years from now, his child will be
13 of his age while his cousin will be
25 of his child. Express his cousin’s present age as a fraction of Perry's present age. Leave your answer in its simplest form.
|
Perry |
Perry's child |
Perry's cousin |
Difference between Perry and Perry's child |
Before |
15 u - 3 |
5 u - 3 |
2 u - 3 |
30 |
Change |
+ 3 |
+ 3 |
+ 3 |
|
After
|
3x5 |
1x5 |
|
|
|
5x1 |
2x1 |
|
Comparing Perry, his child and his cousin in the end |
15 u |
5 u |
2 u |
10 u |
The repeated identity is the age of Perry's child. LCM of 1 and 5 is 5.
The difference in age between Perry and Perry's child remains unchanged.
Difference in age between Perry and Perry's child
= 15 u - 5 u
= 10 u
10 u = 30
1 u = 30 ÷ 10 = 3
His cousin's present age
= 2 u - 3
= 2 x 3 - 3
= 6 - 3
= 3
Perry's present age
= 15 u - 3
= 15 x 3 - 3
= 45 - 3
= 42
His cousin's present age as a fraction of Perry's present age
=
342=
114 Answer(s):
114