Question

Purvi has an average score of 71% in the first 3 unit tests of class 9.
How much should she score in the fourth test to raise her average to 75%?

Answer 1

Answer:

87 marks

Step-by-step explanation:

sum of first 3 scores = 71 × 3  =213.

sum of 4 th scores: 75 × 4 = 300.

purvi need to score ( 300-213 = 87 )

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Answer 2

Answer:

Purvi needs to get 87 marks in the fourth test to raise her average to 75%.

Explanation:

Let the average score in three exams be X.

So,

71% = X% of 100.

∴ X = 71.

The total score becomes,

71 x 3 = 213.

Similarly,

The total score required will be

75 X 4 = 300.

∴ The score required to get the average to 75% = (The new total score) - (The old score)

= 300 - 213

= 87

Answer) Purvi needs to get 87 marks in the fourth test to raise her average to 75%.