Sarah had 9 pennies and 9 dimes. How many coins did she have in all?
Solve (10 − 2)(4 − 6x) = 0
California officials expect math students in public school to know the first answer by the end of second grade—and the second answer by the end of eighth grade. But when some incoming college students were asked these questions, about 20 percent could not correctly count the number of coins, and over 80 percent were unable to solve the equation.
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