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Do you know what 25% is? It is one fourth...one quarter of something. How many quarters make a dollar? Four. If 70 is a quarter what does four of them equal?

4x70=?

c'mon, do your own homework next time.

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Let's assume that the number is X.

Then,

25% of X = 70

or, X * 25/100 = 70

or, X=70 * 100/25

or,X = 280.

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++++++++

280! 25% is equivalent to 1/4 of the whole therefore 70 X 4 = 280!

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You can answer any percent question using the "is over of" method. This is a proportion - an equation where one ratio equals a second ratio. One of the proportions will always be the percent over 100. In this case that is 25/100.

The second proportion will be the number associated with "is" in the question (in this case, 70) over the number that follows the word "of" in the question (in this case, an unknown so we represent it with a variable); 70/x

So the proportion is 25/100 = 70/x

To solve for the unknown (in whatever position it happend to be in for a specific problem) you cross multiply, to obtain: 25x = 100*70.

Solving for x gives x = 7000/25 = 280. So 70 is 25 percent of 280.

This is a perfect example of what I was discussing in my answer to the question "Applications of algebra in real life" https://hubpages.com/question/35620/applications-o...

You may know how to answer the question "What is 25% of 100?" without using algebra; or maybe even "What is 25% of 280?" But when the question is turned around as this one was, you're at a loss as to how to find the answer. Well, as I always say (not really, but it sounds good ), Algebra to the rescue!

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280..

just simple quest,,

70 is 25% from X which X is 100%..

so X is 100%/25% * 70..

ta daaaa 280

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Best answer! Bingo!

Is this a serious question? Most probably not. Patterson has 0 hubs (as of 2010-02-05) since joining two weeks ago. The question is such an elementary algebra problem, I am not even going to address it, even though I was tempted at first. Jeffrey Neal and nadp are both correct, though nadp's response is rather convoluted.

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