Question

Ted went to the nursery and bought some 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
• B. 3600
• C. 0.36
• D. 360

Answer 1

The correct option is B

3600

The area of a rectangle = length x breadth

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

Number of grass beds that were bought = 28

4 beds were unused. Therefore, Ted used
$28-4=24\text{grass beds}$

Thus area of the lawn = $24\times \text{area of each grass bed}$
$=24\times 150=3600c{m}^2$