a math student scored 75, 70, 85, 90, 100on the first five tests he took. after he took his sixth math test, the average is now 85. what did he score in the sixth test
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Step-by-step explanation:
let the last test marks be a
75 + 70 + 85 + 90 + 100 + a/6 = 85
420 + a / 6 = 85
420 + a = 85 × 6 = 510
a = 510 - 420 = 90
He scored 90 marks in the sixth test
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