SOLUTION: a boy received the following marks in algebra: 72,90,70,80. what must be his fifth mark if his average for the five tests is to be 80%?
Algebra ->
Average
-> SOLUTION: a boy received the following marks in algebra: 72,90,70,80. what must be his fifth mark if his average for the five tests is to be 80%?
Log On
Question 819877: a boy received the following marks in algebra: 72,90,70,80. what must be his fifth mark if his average for the five tests is to be 80%? Answer by ewatrrr(24785) (Show Source):
Hi,
a boy received the following marks in algebra: 72,90,70,80. Total 312
what must be his fifth mark if his average for the five tests is to be 80%?
312 + x = 400
x = 88, what his fifth mark must be to average 80%
