Question

A student scored 64% marks in exam.
How much % of total marks should
be reduced so that marks of

student
become 80%.
​

Answer 1

Average = total score / number of tests

total score = 180 + 150 = 330

50% average = 330 * 0.5 = 165 ( he needs to score this )

He has scored 30% in the first test with 180 marks

so he has already scored 0.3 * 180 = 54

Now He needs to score 165-54 = 111 in the second test.

So the precentage = 111/150 = 74

( 0.74 * 150 = 74 * 1.5 = 74 + 74/2 = 74 + 37 = 111 )

BrainlyPrince007