# Geometry Puzzle – Challenge 72

Sharing fun math puzzles like the following one with your kids is a great way to get them thinking mathematically.

## Challenge:

The length of a rectangle is three times its width. What is the ratio of its width to its perimeter?

**A-** 1 : 4

**B-** 1 : 6

**C-** 1 : 8

**D-** 2 : 9

**E-** 3 : 10

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The correct answer is C.

Let x be the width of the rectangle. So, the length of the rectangle is 3x.

Perimeter of a rectangle = 2 × Width + 2 × Length =

2x + 2 (3x) = 8x

The ratio of its width to its perimeter is 1 to 8.

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