Each u. s. penny weighs 2.5 grams. how many pennies (x) are on a scale if their total weight is 37.5 grams
2.5 + x = 37.5
x = 35
2.5 x = 37.5
x = 35
x - 2.5 = 37.5
x = 40
2.5 x = 37.5
x = 18
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