Adam is 25 years old. The total age of Adam and Bryan is 75 years. How many years ago was the ratio of Adam's age to Bryan's age 2 : 7?
| |
Adam |
Bryan |
Total |
Difference |
| Before |
2 u |
7 u |
|
5 u |
| Change |
+ ? |
+ ? |
|
|
| After |
25 |
50 |
75 |
25 |
Bryan's age
= 75 - 25
= 50
Difference in the age between Adam and Bryan
= 50 - 25
= 25
To find the number of years ago for the ratio of Adam's age to Bryan's age to be 2 : 7.
Adam's age = 2 u
Bryan's age = 7 u
Difference in the age
= 7 u - 2 u
= 5 u
5 u = 25
1 u = 25 ÷ 5 = 5
Adam's age then = 2 u = 10
Adam's age now = 25
Number of years ago
= 25 - 10
= 15
Answer(s): 15
