Question

The average of mask donated by 50 students is 30.when the class teacher donated mask,then average increased by 1.how many mask donated by Teacher?

Answer 1

Answer:

Sum = Average × number

Sum of donated mask bt 50 students = 30×50 = 1500

and given that when the teacher donated mask, then average increased by 1 .

so,

Sum = 31 × 51 = 1581

number of mask donated by teacher= 1581 - 1500 = 81 masks

Answer 2

From the given question the correct answer is :

number of mask donated by teacher is  81 masks

Solution:

Sum = Average × number

Sum of donated mask bt 50 students = 30×50 = 1500

and given that when the teacher donated mask, then average increased by 1 .

so,

Sum = 31 × 51 = 1581

number of mask donated by teacher= 1581 - 1500 = 81 masks