Bryan is 28 years old. The total age of Bryan and Adam is 70 years. How many years ago was the ratio of Bryan's age to Adam's age 3 : 5?
|
Bryan |
Adam |
Total |
Difference |
Before |
3 u |
5 u |
|
2 u |
Change |
+ ? |
+ ? |
|
|
After |
28 |
42 |
70 |
14 |
Adam's age
= 70 - 28
= 42
Difference in the age between Bryan and Adam
= 42 - 28
= 14
To find the number of years ago for the ratio of Bryan's age to Adam's age to be 3 : 5.
Bryan's age = 3 u
Adam's age = 5 u
Difference in the age
= 5 u - 3 u
= 2 u
2 u = 14
1 u = 14 ÷ 2 = 7
Bryan's age then = 3 u = 21
Bryan's age now = 28
Number of years ago
= 28 - 21
= 7
Answer(s): 7