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.

  1. A.

    25, 5

  2. B.

    35, 7

  3. C.

    40, 8

  4. 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.

  1. 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).

  2. 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)

  3. Solve for x:

    • 5x + 5 = 3x + 15

    • 5x - 3x = 15 - 5

    • 2x = 10

    • x = 5 (Son's present age)

  4. Find the man's age:

    • Man's age = 5x = 5 * 5 = 25.

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