Anshul and Balendu have 50 cubes of side 1 cm. They decided to make a larger cube by joining these smaller cubes. The number of larger cubes (all of different sizes) they can make is
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Solution
Since the side of the smaller cube is 1 cm, its volume will be 1 cubic cm.
We know that the volume of cubes of sides 1,2,3,4,... are 1,8,27,64...cubic cm. But Anshul and Balendu have only 50 small cubes, so they can make cubes of 3 sizes with the help of 1,8 and 27 smaller cubes. It should be noted that (50-1-8-27) = 14 smaller cubes will be left unused.