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

Question

HIX Tutor · Accepted Answer

undefined To find out what score Trevor got on his first quiz, we can use this step-by-step method:

1. **Let the score of the first quiz be $ x $**.
2. **Trevor needs a 93 on his second quiz**.
3. **To find his average, we add the scores and divide by 2**:

$$
   \text{Average} = \frac{x + 93}{2}
   $$

4. **We want the average to be 90**:

$$
   \frac{x + 93}{2} = 90
   $$

5. **Now, multiply both sides by 2 to get rid of the fraction**:

$$
   x + 93 = 180
   $$

6. **Subtract 93 from both sides**:

$$
   x = 180 - 93
   $$

7. **Calculate $ x $**:

$$
   x = 87
   $$

So, Trevor got **87** on his first quiz.

Eva Adamson · Answer

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 #5,9,123#

Add 'em up

#137#

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

#137/3=45.bar666#

Here... #45.bar666# is the average of the three numbers

Back to the question

Let... the first quiz points be #x#

Then total would be #93+x#

Two numbers would give the average #90# so....

#(93+x)/2=90#

#93+x=180#

#color(blue)(x=87#

Isaiah Anthony · Answer

87

The average of his score can be given by: #(93+"his first quiz mark")/2=90# #93+"his first quiz mark"=90times2# #93+"his first quiz mark"=180# #"his first quiz mark"=180-93=87#

Ethan Adkins · Answer

undefined Trevor received a score of 87 on his first quiz.