Anahera's sweets

This task is about working out costs and quantities.
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Anahera bought some bags of sweets for her whānau.  Each bag cost $3.15. 

Question 2Change answer

a)  How much would 9 bags have cost?  $ 

Question 2Change answer

b)  How much would 7 bags have cost?  $ 

Question 2Change answer

c)  If Anahera spent $31.50, how many bags of sweets did she buy?    bags