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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To find a, you can do 180° - 132°. This would give you 48°. Now to find b, you need to do 180° - (69° + 48)°. This would give you 63° and now, you have your answers.
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