Brain Teasers
Some Algebra 2
The length of a rectangle is 9 centimeters more than half the width. Find the length if the perimeter is 60 centimeters.
Hint
the length= 9+1/2 the width.60= 2width + 2 length
Answer
Length is 16 cm and the width is 14 cm.Solution:
60cm=2width + 2 (9+1/2width)
Distribute the 2 and you get
60cm= 2width + 18 + 1width.
Combine the widths. And subtract 18 from both sides.
42cm= 3 width.
Divide both sides by 3 to get the length of the width.
Width=14cm. Then plug it into the equation for the length and you should get 16cm.
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