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A boy got twice as many items on a test wrong as he got right. If he attempted 51 items in all, how many did he solve correctly?
Answered by mathhelper
number correct ---- x
number incorrect --- 2x

x + 2x = 51

solve for x
Answered by PsyDAG
R = 2W

R + W = 2W + W = 3W = 51

Solve for W then R.
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