How to find decimal equivalent to a percentage - GRE Quantitative Reasoning

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Question

Robert has of his cereal left. Choose the answer which best expresses as a decimal, how much of his cereal he has eaten.

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Answer

The easiest way to convert between percent and decimal is to first convert the percentage into a fraction:

Then, from the fraction, you can convert quite easily to a decimal:

HOWEVER--in this problem, they are asking you for the portion that makes up the rest of the cereal--so you need to subtract your decimal above from , which yields the correct answer:

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