Bryan is 20 years old. The total age of Bryan and Adam is 65 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 |
20 |
45 |
65 |
25 |
Adam's age
= 65 - 20
= 45
Difference in the age between Bryan and Adam
= 45 - 20
= 25
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 = 25
1 u = 25 ÷ 5 = 5
Bryan's age then = 3 u = 15
Bryan's age now = 20
Number of years ago
= 20 - 15
= 5
Answer(s): 5