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3 votes
silvia's test scores are 86,81 and 92 what must she score on her fourth test in order to have an average of 90 for all four tests

User Wingear
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2 Answers

2 votes
90 * 4 = 360 (total of 4 tests for average of 90)

86 + 81 + 82 = 259 (total first 3 tests)

360 - 259 = 101

answer:
In order to have an average of 90, she must score 101 on her 4th test.
User Vidhya Sri
by
8.0k points
6 votes
Silvia has to score a 101 to get an average of 90 for all four tests.
Explanation: 90=(86+81+92+x)/4
360=259+x
101=x
User Mahmoud Moawad
by
8.5k points
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