<PRE><B>Question 35281</B>
Let the score required by josh in the third math test to have a final grade of 85 be denoted x

the first two math test account for 25% for his final grade and the third maath test is worth 50% for final grade

25% is 25/100 = 1/4 and 50% is 50/100 = 1/2

67*(1/4) + 78*(1/4) + x*(1/2) = 85

mutliplying by 4 both sides of equation

67*1 + 78*1 +2*x = 85*4

145 + 2*x = 340
2*x = 195
x = 97.5
Josh has to score 97.5 in his third math test inorder to get 85 in his final grade
</PRE>