Question

.Knowing that Vijay's expenditure for first 3 days is Rs. 100, Rs. 125 and Rs. 85, what is his 4th day expenditure as his 4 days average expenditure Rs. 90? A.220 B.60 C.50 D.90

Answer 1

100 + 125 + 85 + x =310+x

(310+x)/4= 90
310+x = 360
x= 360-310
x= 50
therefore answer is C.50

Answer 2

Vijay has an average expenditure of Rs. 90 for 4 days.

Therefore, his tot expenditure becomes = Rs. 90 x 4 = Rs. 360.

We already know that his expenditure for the first three days are Rs. 100, Ra. 125 and Rs. 85.

Adding up his first three days expenditure, it comes to around Rs. 310.

On subtracting the total of three days expenditure from the total expenditure we get 360 – 310 = Rs. 50.