### Brain Teasers

# Sandcastles

If it takes 20 buckets of sand to make a sandcastle, how many buckets will it need to make another castle of the same shape, but twice as big in each direction ?

### Answer

160 buckets. Since the large castle will be twice as long, twice as wide and twice as high, it will be 2 * 2 * 2 = 8 times the mass of the small one.Hide Answer Show Answer

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