Question 1145657
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<U>MENTAL solution</U>


<pre>
To have a 75 test average of 3 tests, you need to have the sum of these three tests as 3*75 = 225.


You just have 72 and 76 in two first tests.


Hence, you need to get  225 - 72 - 76 = 77.    <U>ANSWER</U>
</pre>


<U>ALGEBRA solution</U>


<pre>
{{{(72 + 76 + x)/3}}} = 75

72 + 76 + x = 3*75 = 225


x = 225 - 72 - 76 = 77.      <U>the same ANSWER</U>
</pre>

Solved.


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