scooby made 70 percent on his science test. if he got 21 problems correct how many problems are on the test
1 answer:
Since the score is 21 out of an unknown number, and the percantage is 70%, you set .7 equal to the score (21/x), and solve for x
.7 = 21/x
Multiply both sides by x
.7x = 21
Divide both sides by .7
x = 30
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