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

1 answer

Let's assume the number is x.
The difference of a number and 7 is x - 7.
Four times that difference is 4(x - 7).
We are given that 4(x - 7) equals 12, so we can write the equation 4(x - 7) = 12.
Now, let's solve for x:
4(x - 7) = 12
Divide both sides by 4:
x - 7 = 3
Add 7 to both sides:
x = 10
Therefore, the number is 10.