Thousand solid metallic spheres of diameter 6 cm are melted and recast into a new solid sphere. The diameter of the new sphere (in cm ) is
30
90
45
45
D.
45
According to the question,
1000 x (3)3 = r3
r = 30 cm
∴ Diameter of the new sphere = 2 x 30 = 60 cm
1980
1981
1983
1983
500 tonnes
1000 tonnes
5000 tonnes
5000 tonnes
15%
30%
50%
50%
1980 and 1981
1982 and 1983
1984 and 1985
1984 and 1985