Bryan is 25 years old. The total age of Bryan and Adam is 78 years. How many years ago was the ratio of Bryan's age to Adam's age 1 : 8?
|
Bryan |
Adam |
Total |
Difference |
Before |
1 u |
8 u |
|
7 u |
Change |
+ ? |
+ ? |
|
|
After |
25 |
53 |
78 |
28 |
Adam's age
= 78 - 25
= 53
Difference in the age between Bryan and Adam
= 53 - 25
= 28
To find the number of years ago for the ratio of Bryan's age to Adam's age to be 1 : 8.
Bryan's age = 1 u
Adam's age = 8 u
Difference in the age
= 8 u - 1 u
= 7 u
7 u = 28
1 u = 28 ÷ 7 = 4
Bryan's age then = 1 u = 4
Bryan's age now = 25
Number of years ago
= 25 - 4
= 21
Answer(s): 21