The average expense of a student at class in four days is 90. If his expense for the first three days are as 100, 125 and 85 respectively, then what will be his expense for the fourth day?
Answers
Answered by
4
Answer:
50
Step-by-step explanation:
We always assume that the total number of expenses is
average x number
In this case
(90x4)
which equalls 360
100+125+85=310
360-310=50
Similar questions