Salma's average in four tests is 80%. What marks does she need in her fifth test to raise her average to 84%?

Salma's average in four tests is 80%. What marks does she need in her fifth test to raise her average to 84%? Correct Answer 100%

Let the required score in the fifth test be X. Then,  (4 x 80 + X)/5 = 84 or,  320 + X = 5 x 84 or,  X = 420 - 320 or,  X = 100%
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