The table shows the prices of muffins at two shops. The muffins are only sold in sets of 4 muffins in Gillian's Bakery or sets of 5 muffins in Gem's Bakery.

Shop	Price of muffins
Gillian's Bakery	4 for $15
Gem's Bakery	5 for $16

1. Fiona has $27.70. She wants to buy 15 muffins from Gem's Bakery. How much more money does she need to buy the 15 muffins?
2. Pierre has $64. He wants to buy the greatest possible number of muffins with his money from one of the two shops. What is the greatest possible number of muffins he can buy with his money?

(a)
Number of sets of 5 muffins
= 15 ÷ 5
= 3

Cost of 15 muffins 
= 3 x 16
= $48

Amount that Fiona needs more to buy the 15 muffins
= 48 - 27.70
= $20.30

(b)
Number of sets of 4 muffins that Pierre could buy at Gillian's Bakery
= 64 ÷ 15
= 4 r 4

Number of muffins that Pierre could buy at Gillian's Bakery
= 4 x 4
= 16 

Number of sets of 5 muffins that Pierre could buy at Gem's Bakery
= 64 ÷ 16
= 4 r 0

Number of muffins that Pierre could buy at Gem's Bakery
= 4 x 5
= 20 (More)

Greatest possible number of muffins that Pierre can buy with his money = 20

Answer(s): (a) $20.30; (b) 20