To complete this task, we must first find the length value, knowing that 3/7 of it is 24 decimetres. In order to find a number by its part, we need a number that expresses the part divided by a fraction.
24: 3/7 = (24 * 7) / 3 = 168/3 = 56 dm.
Multiply the whole number 24 by the denominator 7, and then divide the resulting number by the numerator 3.
Let’s calculate what the perimeter of a rectangle is equal to, in which the length is 56 dm, and the width is 24 dm.
P = 2 * (56 + 24) = 2 * 80 = 160 dm.
Answer: 160 decimeters.
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