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Question

A toy in the shape of a hemisphere of radius 7cm is surmounted by a cone of slant height 25cm. The toy is placed in a cylindrical box of radius 70cm and height 1m, which is to be packed and dispatched. Find how many such toys can be accomodated in the box. Assume packaging occupies a volume of 113 cm3 for each toy and all toys needs to be packed.(Take π=227)
  1. 788

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Solution

The correct option is A 788

Volume of the toy = volume of hemisphere + volume of cone

Height of the cone, h = (25)2(7)2 = 24

=23πr3+13πr2h

= 227×(7)2[2×73+8]

= 1950.66cm3

Volume of the box = πr2h = 227×(70)2100 = 1540000cm3

Volume of the toy + packaging volume = 1950.66+113=5862.983

Number of packaged toys that can fit into the box = volume of boxvolume of packaged toy

=1540000(5862.983) ≈ 788.


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