Easy #5
A jar of mixed lollies contains g of jellybeans, g of licorice bullets and g of bilby bears. Extra bilby bears are added to make the mix bilby bears by weight. How many grams of bilby bears are added?
The answer is 110.
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1 solution
To make the bears 50% of the mass (unless it's 100g N of jelly beans - quite a lot) their total mass must be equal to the sum of the masses of the other two sweet types - i.e. 130g (100+30.) Since there are 20g already, the mass added is 130-20 = 110g.
Just never give this question to a physicist like myself or they get rather annoyed at the casual incorrect use of the term 'weight'.