Bryan is 23 years old. The total age of Bryan and Adam is 66 years. How many years ago was the ratio of Bryan's age to Adam's age 3 : 8?
| |
Bryan |
Adam |
Total |
Difference |
| Before |
3 u |
8 u |
|
5 u |
| Change |
+ ? |
+ ? |
|
|
| After |
23 |
43 |
66 |
20 |
Adam's age
= 66 - 23
= 43
Difference in the age between Bryan and Adam
= 43 - 23
= 20
To find the number of years ago for the ratio of Bryan's age to Adam's age to be 3 : 8.
Bryan's age = 3 u
Adam's age = 8 u
Difference in the age
= 8 u - 3 u
= 5 u
5 u = 20
1 u = 20 ÷ 5 = 4
Bryan's age then = 3 u = 12
Bryan's age now = 23
Number of years ago
= 23 - 12
= 11
Answer(s): 11
