You have an 85% average in math after 2 tests. If you score a 40% on this test, what will your new average be?
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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 $\displaystyle \mbox{Average Score } = \frac {\mbox{Sum of scores}}{\mbox{Number of scores}}$ So, your old average was $\displaystyle \frac {170}2$ % your new average is $\displaystyle \frac {170 + 40}3$ %
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? $\displaystyle \frac{x + y}{2} = 85 \Rightarrow x + y = 170$. $\displaystyle \frac{x + y + 40}{3} = ? \Rightarrow \frac{170 + 40}{3} = ? \Rightarrow ? = ......$. If the third test was on finding averages, you should get 60% as the answer .......
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