Duangsilvinawho Duangsilvinawho

13-11-2016
Mathematics

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scooby made 70 percent on his science test. if he got 21 problems correct how many problems are on the test

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DazedAndConfused1 DazedAndConfused1

13-11-2016

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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