A number when multiplied by 4 increases by 54. Find the number.

The correct answer is 18

Let the number be x
∴ We can write the equation as follows
x * 4 = x + 54
∴ 4x = x + 54
∴ 3x = 54
∴ x = $\frac{54}{3}$ = 18

∴ The number is 18