In order to find out the value of a whole, if its part is known, it is necessary to multiply it by the denominator of the fraction and divide by its numerator.
Find the width of the rectangle, provided that its length = 30 cm and is 5/3 of the width:
30 * 3: 5 = 90: 5 = 18 cm – width.
The area of such a figure is calculated by the formula:
S = a * b = 30 * 18 = 540 cm².
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