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1 . Average mark in Math in a class of 40 students is 45. Average mark of all the 30 boys is 50. Then the average mark obtained by the girls is :

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Answer: Option A

Explanation:

No. of students = 40

No. of Boys = 30

No. of Girls = 10

Average of 40 stuents = 45

Total of students = 45 *40 = 1800

Aerage of 30 students = 50

Total of 30 = 30 * 50 = 1500

Total of 10 girls = 1800 - 1500 = 300

Average mark of 10 girls = 300/10 = 30

Bangladesh Bank - Assistant Director - 2010