Sarah correctly answers 21 questions on her reading test. There are 30 questions on the test.
1 answer:
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Lets just use 
for an example. If the number is increased by 60% and the denominator is decreased by 20% we get the new fraction being: 
. Since then new one is equal to 1, and the original is equal to 
, we see that this manipulation of the fraction causes an increase of 100%.