EloiseGracelyn EloiseGracelyn

13-04-2016
Mathematics

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after five tests, Mike's average score is 91. After 6 tests, his average score was 89. what was his score, on the sixth test?

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13-04-2016

( x 1 + x 2 + x 3 + x 4 + x 5 ) / 5 = 89 Multiply both sides by 5

x 1 + x 2 + x 3 + x 4 + x 5 = 89 * 5 = 445

( x 1 + x 2 + x 3 + x 4 + x 5 + x 6 ) / 6 = 90

( 445 + x 6 ) / 6 = 90 Multiply both sides by 6

445 + x 6 = 6 * 90 = 540

x 6 = 540 - 445 = 95

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