# Question edb0e

Jun 21, 2017

351

#### Explanation:

To answer this question, the sum of 3 numbers needs to be subtracted from the sum of all 4 numbers. You can find the sum of 3 numbers by multiplying the given average by 3.

$293 \cdot 3 = 879$

Now you can subtract this total from the total of all four numbers.

$1230 - 879 = 351$

The fourth number is 351!

Jun 21, 2017

351

#### Explanation:

To find the sum of the three numbers that average to 293, multiply 293 by 3.

$293 \cdot 3 = 879$

You multiply by 3 because when you originally find the average of 3 numbers, you divide the sum of the numbers by 3.

average = sum of numbers /  of numbers

If you subtract 879 from the sum of all 4 numbers (1230), then you know the fourth number.

$1230 - 879 = 351$

The fourth number is 351.