the average number of masks given by 25students is 30when the class teacher brings the mask, the average number increas by 2.so what is the number of masks brought by the class teacher?
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Step-by-step explanation:
Average of a student before - 30
Total mask given before - 25 × 30 = 750
New average - 30 + 2 = 32
total mask given after - 32 × 25 = 800
Mask brought by class teacher - 800-750
=50
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