test average

**DINOCALC09** · February 25th 2008, 07:32 PM

You have an 85% average in math after 2 tests. If you score a 40% on this test, what will your new average be?

**Jhevon** · February 25th 2008, 07:40 PM

Originally Posted by DINOCALC09

You have an 85% average in math after 2 tests. If you score a 40% on this test, what will your new average be?

lets count by points. so 85% means you average 85 points.

Now $\mbox{Average Score } = \frac {\mbox{Sum of scores}}{\mbox{Number of scores}}$

So, your old average was $\frac {170}2$ %

your new average is $\frac {170 + 40}3$ %

**mr fantastic** · February 25th 2008, 07:41 PM

Originally Posted by DINOCALC09

You have an 85% average in math after 2 tests. If you score a 40% on this test, what will your new average be?

$\frac{x + y}{2} = 85 \Rightarrow x + y = 170$ .

$\frac{x + y + 40}{3} = ? \Rightarrow \frac{170 + 40}{3} = ? \Rightarrow ? = ......$ .

If the third test was on finding averages, you should get 60% as the answer .......

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