Question

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).

• A. 4200 sqcm
• B. 3600 sqcm
• C. 0.36 sqcm
• D. 360 sqcm

Answer 1

The correct option is B

3600 sqcm

Area of a rectangle = length x breadth

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

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 =
$24\times areaofeachgrassbed=24\times 150=3600c{m}^2$