Posted by peter on Thursday, October 27, 2011 at 12:21pm.
Joel and jacob are brothers. This year both of their ages are prime numbers. Last year both of their ages were composite numbers.Both of their ages will be composite numbers again over the next three years. If joel and jacob are both teenagers, how old are they now?

math  sam, Thursday, October 27, 2011 at 2:52pm
bit.ly/o3fZeG

math  Steve, Thursday, October 27, 2011 at 4:02pm
The only teen primes are 13 and 17 and 19
17 is no good, since 18,19,20 are not all composite.
So, they are 13 and 19
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