Brain Teasers
Reduce, Reuse, Recycle
For every 3kg of aluminium trash that Mr Green recycles, he can make 20 new biscuit tins. How many biscuit tins can he obtain from 11kg of aluminium trash and how many kilograms of aluminium material will be left over?
Hint
Simple maths.Answer
He can make 73 biscuit tins. He will have 0.05kg of aluminium material left.3kg make 20 tins. Therefore 9kg will make 60 tins.
11kg - 9kg = 2kg
20 tins use 3kg, 1 tin will use 0.15kg, 13 tins will use 1.95kg.
2kg - 1.95kg = 0.05kg.
60 tins + 13 tins = 73 tins.
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