Question 1120144: Kim is 3 years older than John. The sum of their ages is less than 16. What is the oldest John could be?
Answer by ikleyn(52803)   (Show Source):
You can put this solution on YOUR website! .
Kim + John < 16
(J+3) + J < 16
2J + 3 < 16
2J < 16 - 3 = 13 ====> J < 13/2 = 6.5.
Assuming John's age is an integer number, you get the solution set J <= 6 for John.
Answer. The solution set for John's age is {1, 2, 3, 4, 5, 6}.
P.S. I do not consider the possibility for John to be 0 years old.
Although the child can be younger than 1 year, I never saw or heard the phrase "the child is 0 years old".
But since English is my second language, I do not consider myself as an expert in such kind of suggestions.
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