The weight of a circular disc varies as the square of the radius when the thickness remains; the same it also varies as the thickness when the radius remains the same. Two discs have their thicknesses in the ratio of 9:8; the ratio of their radii if the weight of the first is twice that of second is
a) 4:3
b) 5:2
c) 2:1
d) 1:2
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Answer:
a) 4:3
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