Question : Direction: Joan's age is 42, and Kelvin's age is 26. How many years ago was Kelvin's age half of Joan's age?
Option 1: 6 years
Option 2: 4 years
Option 3: 10 years
Option 4: 8 years
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Correct Answer: 10 years
Solution : Given:
Joan's present age = 42 years
and, Kelvin's present age = 26 years
Before years let the age was X years.
According to the question →
Kelvin's age = 1 / 2 Joan's age
⇒ 26 - X = 1 / 2 ( 42 - X )
⇒ 52 - 2X = 42 - X
⇒ X = 52 - 42 = 10 years.
So, 10 years ago Kelvin's age was half of Joan's age.
Hence, third option is correct.
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