Posted by Ryan on Monday, November 7, 2011 at 8:14pm.
Mike has made a rectangle using 48 square tiles. If he adds the length and width of his rectangle together he gets a prime number. What is the length and width of the rectangle?

math  Steve, Tuesday, November 8, 2011 at 5:30am
If he adds length and width to get a prime, then their sum must be odd. So, one of the terms is even, the other odd. The only factors of 48 that fit these conditions are 3 and 16
3*16 = 38
3+16 = 19 a prime

math  Steve, Tuesday, November 8, 2011 at 5:30am
oops: 3*16 = 48
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