Question

If 3 times a number minus 2 equals 13, what is the number?

A. 4
B. –6
C. 5
D. 2

Answer 1

3x - 2 = 13
+ 2 + 2
3x = 15
3 3
x = 5

The answer is C.

Answer 2

Let the number be x:

3*x-2=13

∴3x=13+2

∴3x=15 (divide both sides by 3)

∴x=5 the answer is C