Using proportions, it is found that Malik cut the board 8 2/5 inches long, using a mixed number.
What is a proportion?
A proportion is a fraction of a total amount, and the measures are related using a rule of three.
He cut the board too long, with a 12% error, hence the length is 7 1/2 = 7.5 inches multiplied by 1.12, which is:
7.5 x 1.12 = 8.4.
0.4 = 4/10 = 2/5, hence as a mixed number, the length is given by:
8 2/5 inches long.
More can be learned about proportions at https://brainly.com/question/24372153
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