GRE Math : How to find a ratio

Study concepts, example questions & explanations for GRE Math

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Example Questions

Example Question #21 : Proportion / Ratio / Rate

A fence has a post that is 5 in wide. The fence is constructed with 5 foot pieces. What is a possible length of a straight fence if it starts and ends with a post with a post between each piece of fence.

Possible Answers:

\displaystyle 135in

\displaystyle 130in

\displaystyle 125in

\displaystyle 60in

\displaystyle 65in

Correct answer:

\displaystyle 135in

Explanation:

You must convert all the measurements to inches first so the fence pieces will be \displaystyle 60in 

\displaystyle (5ft*12=60in).  

For one piece of fence, it would be two posts and one fence piece 

\displaystyle (5in+5in+60in=70in).

For two pieces of fence, it would be three posts and two pieces of fence which would be the answer of 

\displaystyle 135in (5in+60in+5in+60in+5in=135in).

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