number correct ---- x
number incorrect --- 2x
x + 2x = 51
solve for x
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?
2 answers
R = 2W
R + W = 2W + W = 3W = 51
Solve for W then R.
R + W = 2W + W = 3W = 51
Solve for W then R.