Bryan is 30 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 |
30 |
40 |
70 |
10 |
Adam's age
= 70 - 30
= 40
Difference in the age between Bryan and Adam
= 40 - 30
= 10
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 = 10
1 u = 10 ÷ 2 = 5
Bryan's age then = 3 u = 15
Bryan's age now = 30
Number of years ago
= 30 - 15
= 15
Answer(s): 15