Average Practice Test 4

Question : 38 of 40

Marks: +1, -0

The average score of three boys in mathematics is 30. When the score of the fourth boy is added to the total score of the three boys, the average is lowered to 25. What is the score of the fourth boy?

Validate

Solution:

Average score of three boys in mathematics = 30
Total score of three boys = 30 × 3 = 90
According to the statement, the score of the fourth boy is:

{90+x}/4=25

90+x=100

x=10

score

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