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An ice-cream cone of radius $r$ and height $h$ is completely filled by two spherical scoopes of ice-cream. If radius of each spherical scoop is $\frac{r}{2}$, then $h: 2r$ equals
- (a)$1:8$
- (b)$1:1$
- (c)$1:2$
- (d)$2:1$
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(B) $1:2$