Question

The no. of stones of size 20cm * 30cm, required to cover a square field of 3 meter side, are:
a. 75
b. 100
c. 125
d. 150

Answer 1

$<b>Heya mate. (^_-). Solution below.$
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• Given length of 1 stone = 20 cm

• Given breadth of 1 stone = 30 cm


• Then, area of 1 stone

= Length × breadth

= 20 × 30

= 600 cm²



• Given side of square field = 3 m = 300 cm


• Then area of field

= side²

= (300 cm)²

= 90000 cm²



• Now, number is stones required to cover the square field

= Area of field/area of 1 stone

= 90000/600

= 150 stones


$<marquee>Hence, your answer is 150 stones (option D).</marquee>$
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Thank you.. ;-)