Mr. McCoy spent 35 cents at the hardware store buying nails and screws. Nails cost 4 cents, and screws cost 3 cents. If Mr. McCoy bought exactly 10 items, how many of each did he buy?

Answer 1

4 n + 3 s = 35
n + s = 10 so s = (10-n)

4 n + 3 (10-n) = 35
n + 30 = 35
n = 5
so s =5
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check
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4*5 +3*5 = 20 + 15 = 35 whew we did it

Answer 2

Are you a student?

Answer 3

Of course, also a retired professor.