Class IX
RATIO AND PROPORTION
1.
The price of a necklace varies directly as the number
of pearls in it. Also, it varies directly as the square
root of radius of a pearl. The price of a necklace
was Rs. 150, when it had 75 pearls each of radius
1 cm. Find the radius of the pearl of a necklace
having 100 pearls whose cost is Rs, 600,
(1) 2 (2) 9 (3) 3 (4) 4
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