John is 4 years older than David and Joe is 2 years younger than David. If the sum of their ages is 41, how old will John be in 8 years ' time?
- 24
- 25
- 17
- None of these
Explanation
Let's define the ages of the three people:
- Let David's age be .
- John's age is 4 years more than David's, so John's age is .
- Joe's age is 2 years less than David's, so Joe's age is.
The sum of their ages is given as 41:
Simplify the equation:
Subtract 2 from both sides:
Divide both sides by 3:
So, David is 13 years old.
- John's age is years.
- In 8 years, John's age will be:
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