Bonnie has to maintaining an average of 90 in all of her classes to have an A average . In math , she has scored 93,70,99 and 95 on the first four tests . What must she score on the last test to have an average 90 ?
solve this equation : (93+70+99+95+x) / 5 = 90
=> x = 93.
So that She must get at least 93 for reach an A :) Hope it can help
Thanks, Noobfromvn !!!