How many times will the area of a rectangle with countries 20cm and 30cm decrease if the smaller side is reduced by 5cm, and the larger one by 10cm.
Let’s calculate the area of this rectangle, for this we multiply its width by its length:
20 * 30 = 600 cm2.
Let’s calculate what the new width of the rectangle will be if we reduce it by 5 cm:
20 – 5 = 15 cm.
Let’s calculate what the new length of the rectangle will be if we reduce it by 10 cm:
30 – 10 = 20 cm.
Let’s calculate the area of the new rectangle:
15 * 20 = 300 cm2.
Let’s find out how many times the area of the rectangle will decrease:
600: 300 = 2 times.
Answer: the area of the rectangle will decrease by 2 times.
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