Bryan is 27 years old. The total age of Bryan and Adam is 81 years. How many years ago was the ratio of Bryan's age to Adam's age 1 : 4?
| |
Bryan |
Adam |
Total |
Difference |
| Before |
1 u |
4 u |
|
3 u |
| Change |
+ ? |
+ ? |
|
|
| After |
27 |
54 |
81 |
27 |
Adam's age
= 81 - 27
= 54
Difference in the age between Bryan and Adam
= 54 - 27
= 27
To find the number of years ago for the ratio of Bryan's age to Adam's age to be 1 : 4.
Bryan's age = 1 u
Adam's age = 4 u
Difference in the age
= 4 u - 1 u
= 3 u
3 u = 27
1 u = 27 ÷ 3 = 9
Bryan's age then = 1 u = 9
Bryan's age now = 27
Number of years ago
= 27 - 9
= 18
Answer(s): 18
