A man’s age is 5 times his son’s age. After 5 years, the man’s age will be…
2016
A man’s age is 5 times his son’s age. After 5 years, the man’s age will be three times his son’s age. Find their present ages.
- A.
25, 5
- B.
35, 7
- C.
40, 8
- D.
45, 9
Attempted by 31 students.
Show answer & explanation
Correct answer: A
Step-by-Step Solution
To find the present ages of the man and his son, we can set up two linear equations based on the information provided.
Define the variables:
Let the son's present age be x.
Then, the man's present age is 5x (since it is 5 times the son's age).
Set up the equation for the future scenario:
After 5 years, the son's age will be (x + 5).
After 5 years, the man's age will be (5x + 5).
According to the problem, the man's age will be three times the son's age: 5x + 5 = 3 * (x + 5)
Solve for x:
5x + 5 = 3x + 15
5x - 3x = 15 - 5
2x = 10
x = 5 (Son's present age)
Find the man's age:
Man's age = 5x = 5 * 5 = 25.