Rita's marks in four test are 82,80,76 and 70 .how many marks must she get on the fifth test to raise her average to 80
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the answer is 92.
let the marks in fifth test be X.
average = total marks obtained ÷ total no of attempts
so , 82+80+76+70+X ÷ 5 = 80
= 308+X ÷5= 80
= 5*80 = 308 +X
= 400 = 308 + X
= 400-308 = X
=92 =X
so she must get 92 marks in 5th test
let the marks in fifth test be X.
average = total marks obtained ÷ total no of attempts
so , 82+80+76+70+X ÷ 5 = 80
= 308+X ÷5= 80
= 5*80 = 308 +X
= 400 = 308 + X
= 400-308 = X
=92 =X
so she must get 92 marks in 5th test
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