ISEE Middle Level Quantitative : Squares

Study concepts, example questions & explanations for ISEE Middle Level Quantitative

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Example Questions

Example Question #111 : Geometry

David wants to put a fence around his backyard. How much fencing will he need if his backyard is \displaystyle 10ft by \displaystyle 9ft?

 

Possible Answers:

\displaystyle 34ft

\displaystyle 35ft

\displaystyle 38ft

\displaystyle 36ft

\displaystyle 37ft

Correct answer:

\displaystyle 38ft

Explanation:

The fence is going around the backyard, so this is a perimeter problem. 

\displaystyle P=2l+2w

\displaystyle P=2(10)+2(9)

\displaystyle P=20+18

\displaystyle P=38

Example Question #1421 : Common Core Math: Grade 4

What is the length of a rectangular room with a perimeter of \displaystyle 88ft and a width of \displaystyle 20ft?

 

Possible Answers:

\displaystyle 20ft

\displaystyle 22ft

\displaystyle 23ft

\displaystyle 21ft

\displaystyle 24ft

Correct answer:

\displaystyle 24ft

Explanation:

\displaystyle P=2l+ 2w

We have the perimeter and the width, so we can plug those values into our equation and solve for our unknown. 

\displaystyle 88=2l+2(20)

\displaystyle 88=2l+40

Subtract \displaystyle 40 from both sides

\displaystyle 88-40=2l+40-40

\displaystyle 48=2l

Divide \displaystyle 2 by both sides

\displaystyle \frac{48}{2}=\frac{2l}{2}

\displaystyle 24=l

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