Four times the difference of a number and 7 is 12. What is the number?

10
-4
16
20

1 answer

Let's call the number x.

The difference of a number and 7 is x - 7.

Four times the difference is 4(x - 7).

According to the problem, this expression is equal to 12:

4(x - 7) = 12

Now, let's solve for x:

4x - 28 = 12

Adding 28 to both sides of the equation:

4x = 40

Dividing both sides of the equation by 4:

x = 10

Therefore, the number is 10.
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