Question 323345
    On three tests, each graded on a scale of 0 to 100, Jim had average score of 78. If Jim pulls his average up to 84 after taking two additional tests, what is the lowest possible score he could have received on one of the last two tests?
.
Let x = lowest score
then
(78+x+100)/3 = 84
78+x+100 = 252
x+178 = 252
x = 74