Ted went to a nursery and bought saplings. At the nursery, grass beds were being sold. In order to put them in his lawn, he bought 28 rectangular grass beds measuring 10 cm by 15 cm. When he went back and arranged them in his lawn, 4 beds were left unused. Find the area of the lawn (in square cm).

4200 sqcm

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3600 sqcm

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0.36 sqcm

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360 sqcm

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Solution

The correct option is D
3600 sqcm

Area of a rectangle = length x breadth

The area of each grass bed = $10 c m \times 15 c m = 150 {c m}^{2}$

Number of grass beds that were bought = 28

4 beds were unused. Therefore, Ted used 28-4 = 24 grass beds

Thus area of the lawn =
$24 \times a r e a o f e a c h g r a s s b e d = 24 \times 150 = 3600 c m^{2}$

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The correct option is D 3600 sqcm Area of a rectangle = length x breadth The area of each grass bed = 10 cm×15 cm=150 cm2 Number of grass beds that were bought = 28 4 beds were unused. Therefore, Ted used 28-4 = 24 grass beds Thus area of the lawn = 24×area of each grass bed=24×150=3600 cm2