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OpenStudy (wormynut):
please help! i have my finals tommorow!! Sam scored 75,82 and 90 in 3 maths tests.How many marks must he obtain in th next test to have an average of exactly 85 for the 4 maths tests?
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OpenStudy (welshfella):
let x be the score in the nest test then (75 + 82 + 90 + x) / 4 = 85 247 + x = 4*85 find x
OpenStudy (wormynut):
thankyoouuuuu!!
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