<PRE><B>Question 613973</B>
What should be the grade of the fifth quiz of Ehm to raise her average from 85 to 87? 
:
Assume the first 4 grades are 85
Let x = the fifth grade
:
{{{(4(85) + x)/5}}} = 87
:
{{{(340 + x)/5}}} = 87
Multiply both sides by 5
340 + x = 5(87)
x = 435 - 340
x = 95 is the grade required to raise her average to 87
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