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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We can make a table for this one:
ReplyDelete| Foil wrappers | Not foil wrappers
_______________________|_________________ |____________________
Chocolate | 15 | 7
_______________________|_________________ |____________________
Not Chocolate | | 9
______________________ |_________________ |____________________
| 20 | 16
From this, we get a total of 15 + 7 = 22 chocolate biscuits