Respuesta :

Set up an equation.


Let w = whole number


84 = 0.70w


84/0.70 = w


120 = w


Answer:

The whole number was 120.

Step-by-step explanation:

Let the whole number that is to be determined is = x

Then 70% of this number = 70% of x

Replace 'of' by the sign of multiplication

70% of x = [tex]x\times \frac{70}{100}[/tex]

              = 0.7x

If 70% of x is equal to 84 then the expression will be

0.7x = 84

x = [tex]\frac{84}{0.7}[/tex]

x = [tex]\frac{840}{7}[/tex]

x = 120

Therefore, the whole number was 120.