A box of biscuits
A box of biscuits contains 36 biscuits. 20 biscuits have foil wrappers. 15 are chocolate biscuits with foil wrappers. If 9 are not chocolate and do not have a foil wrapper, then how many chocolate biscuits are there?
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Split the shape into lots of equilateral triangles, the same size as the ones already split on the sides. Then just count the shaded ones logically and you will get your answer as 1/2 or 0.5 or half
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