Bryan is 20 years old. The total age of Bryan and Adam is 82 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 |
20 |
62 |
82 |
42 |
Adam's age
= 82 - 20
= 62
Difference in the age between Bryan and Adam
= 62 - 20
= 42
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 = 42
1 u = 42 ÷ 3 = 14
Bryan's age then = 1 u = 14
Bryan's age now = 20
Number of years ago
= 20 - 14
= 6
Answer(s): 6