Question

gale's grade in science for the term is determined by the average of five test grades. his first four grades are 80, 95, 78, and 90. in order to get a b for the term, gale needs to have an average of 84. what grade must gale get on the next test to get a b for the term? write an inequality and solve.

Answer 1

He needs at least 77 on the 5th test.

T₅ ≥ 77

Explanation:

If five numbers are to average 84, then their sum must be (5 x 84) = 420 .

Gale needs his five grades to add up to 420.

So far, he has (80 + 95 + 78 + 90) = 343 .

He needs at least (420 - 343) = 77 more points on the 5th test.