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Question

The diameter of a wheel is 84 cm. How many revolutions will it make to cover 792 m?
(a) 200
(b) 250
(c) 300
(d) 350

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Solution

(c) 300

Let d cm be the diameter of the wheel.
We know:
Circumference of the wheel=π×d
=227×84 cm=264 cm

Now,
Number of revolutions to cover 792 m=792×1000264
=300

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