SOLUTION: so my question is from algebra readiness so here it is "Mai has scored 99, 69, 74, and 89 on her previous four tests. What score does she need on her next test so that her average

Algebra ->  Average -> SOLUTION: so my question is from algebra readiness so here it is "Mai has scored 99, 69, 74, and 89 on her previous four tests. What score does she need on her next test so that her average       Log On


   

Question 759759: so my question is from algebra readiness so here it is "Mai has scored 99, 69, 74, and 89 on her previous four tests. What score does she need on her next test so that her average (mean) is 78?"
Answer by sachi(548) About Me  (Show Source):
You can put this solution on YOUR website!
let the score in next test is x
so the average of 5 tests=(99+69+74+89+x)/5=78
or 331+x=78*5=390
or x=the required score=390-331=59