The table shows the prices of cookies at two shops. The cookies are only sold in sets of 5 cookies in Vanessa's Bakery or sets of 6 cookies in Xandra's Bakery.

Shop	Price of cookies
Vanessa's Bakery	5 for $8
Xandra's Bakery	6 for $11

1. Gabby has $20.50. She wants to buy 12 cookies from Xandra's Bakery. How much more money does she need to buy the 12 cookies?
2. Xavier has $78. He wants to buy the greatest possible number of cookies with his money from one of the two shops. What is the greatest possible number of cookies he can buy with his money?

(a)
Number of sets of 6 cookies
= 12 ÷ 6
= 2

Cost of 12 cookies 
= 2 x 11
= $22

Amount that Gabby needs more to buy the 12 cookies
= 22 - 20.50
= $1.50

(b)
Number of sets of 5 cookies that Xavier could buy at Vanessa's Bakery
= 78 ÷ 8
= 9 r 6

Number of cookies that Xavier could buy at Vanessa's Bakery
= 9 x 5
= 45 (More)

Number of sets of 6 cookies that Xavier could buy at Xandra's Bakery
= 78 ÷ 11
= 7 r 1

Number of cookies that Xavier could buy at Xandra's Bakery
= 7 x 6
= 42

Greatest possible number of cookies that Xavier can buy with his money = 45

Answer(s): (a) $1.50; (b) 45