# Trevor needs a 93 on his second quiz to have a quiz average of 90. What score did Trevor receive on his first quiz?

##### 2 Answers

May 16, 2018

87

#### Explanation:

The average of his score can be given by:

May 16, 2018

To find the average... we always have to add all the numbers and divide it by the number of the numbers

For example....

Find the average of

Add 'em up

Three number added this up... so divide this number by 3 to find average

Here...

Back to the question

Let... the first quiz points be

Then total would be

Two numbers would give the average