Question

19 less than 1 half a number is -13

Answer 1

12

Explanation:

The number can be represented as x, so we can write an equation for this

Half the number can be said as 1/2x

19 less can be said with the other equation as 1/2x - 19

So it ends up being

1/2x - 19 = -13

To isolate the x, we add 19 to both sides, which makes it:

1/2x = 6

Multiplying both sides by the denominator makes the equation

x = 12

So the mystery number is 12