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Tim has a picture frame that is 30 cm long and 24 cm wide. He wants to make a picture frame that is similar in shape but is 18 cm long. How wide should this second picture frame be?
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4 votes
Tim has a picture frame that is 30 cm long and 24 cm wide. He wants to make a picture frame that is similar in shape but is 18 cm long. How wide should this second picture frame be?

User Michael Dorfman
by
7.8k points

2 Answers

4 votes
30 - 24 = 6
18 - 6 = 12
12 cm wide
User StickyCube
by
8.5k points
3 votes
We can set up a proportion to find the same shape.

30/24 = 18/x

x stands for how wide in cm.

30/24 = 18/x

Cross multiply

30*x = 30x
24*18 = 432

432 = 30x

30x/30 = 432/30

x= 14.4

Answer: The width should be 14.40 cm wide.
User Francesco Donzello
by
8.4k points
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