Mr Wesley is 2 times as old as his son, Harry. 15 years ago, the ratio in the age of Mr Wesley and Harry was 9 : 2. Find Harry's current age.
|
Mr Wesley |
Harry |
Difference |
Before |
9x1 = 9 u |
2x1 = 2 u |
7x1 = 7 u |
Change |
+ 15 |
+ 15 |
|
After |
2x7 = 14 u |
1x7 = 7 u |
1x7 = 7 u |
The difference in the age of Mr Wesley and Harry at first and in the end remains unchanged. Make the difference in age the same. LCM of 7 and 1 is 7.
The increase in the age of Mr Wesley and Harry is the same.
Increase in Harry's age
= 7 u - 2 u
= 5 u
5 u = 15
1 u = 15 ÷ 5 = 3
Harry's current age
= 7 u
= 7 x 3
= 21
Answer(s): 21