Wednesday, July 10, 2013

SAT math question about percents

SAT math question about percents

I need help with the following sat math question: 

"30% of what number is 90?"

Answer
http://www.satmath4u.com/threads/44-sat-math-percents

Percents are a very easy way to express fractions as parts of a whole. Basically, a percent is a fraction whose denominator is 100. When you see a percent, you know that it represents a fraction of 100, which makes it easy to understand. 

The equation, 0.30x = 90, may be used to solve the problem. Dividing both sides of the equation by 0.30 gives x = 300.

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