Bryan is 23 years old. The total age of Bryan and Adam is 71 years. How many years ago was the ratio of Bryan's age to Adam's age 2 : 7?
| |
Bryan |
Adam |
Total |
Difference |
| Before |
2 u |
7 u |
|
5 u |
| Change |
+ ? |
+ ? |
|
|
| After |
23 |
48 |
71 |
25 |
Adam's age
= 71 - 23
= 48
Difference in the age between Bryan and Adam
= 48 - 23
= 25
To find the number of years ago for the ratio of Bryan's age to Adam's age to be 2 : 7.
Bryan's age = 2 u
Adam's age = 7 u
Difference in the age
= 7 u - 2 u
= 5 u
5 u = 25
1 u = 25 ÷ 5 = 5
Bryan's age then = 2 u = 10
Bryan's age now = 23
Number of years ago
= 23 - 10
= 13
Answer(s): 13
