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3 votes
If you know that 84 is 70% of a whole, explain how you can use proportional reasoning to determine the whole

User Darkownage
by
8.1k points

2 Answers

1 vote

Set up an equation.


Let w = whole number


84 = 0.70w


84/0.70 = w


120 = w


User Bmdelacruz
by
7.4k points
2 votes

Answer:

The whole number was 120.

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 =
x* (70)/(100)

= 0.7x

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

0.7x = 84

x =
(84)/(0.7)

x =
(840)/(7)

x = 120

Therefore, the whole number was 120.

User Nithin Paul
by
7.9k points

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