Question

jacqui has grades of 87 and 83 on her first two algebra tests. if she wants an average of at least 74, what possible scores can she make on her third test?

Answer 1

Find this:

87 + 83 + x
----------------- = 74
3

Mult. both sides by 4: 87+83+x = 222, and 170 + x = 222

Then x = 222-170 = 52.

With a score of 52 or better on her 3rd test, J. would have an average of 74 or better.

Answer 2

(80+82+x)/ 3>=74
(80+82+x)=3x74
162+x>=222
x>=60
she has to have 60 or above.