Question

the average of mask donated by 50 students is 30 when the teacher donated mask the average increased by 1.how much mask did the teacher donated?
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Answer 1

the teacher donated average 2

Answer 2

Given,

Total students = 50

Average masks by students = 30

When teacher donated masks the average increased by 1

To find,

The number of masks donated by the teacher.

Solution,

First of all, we need to calculate the total number of masks that is donated by the students.

Total masks = Average × Total students = 50×30 = 1500

Now, the average masks when teacher donated

= 30+1 = 31

Total masks when teacher donated = 31 × 51 = 1581

Teacher donated = 1581-1500 = 81

Hence,the teacher donated 81 masks.