The table shows the prices of biscuits at two shops. The biscuits are only sold in sets of 3 biscuits in Tammy's Bakery or sets of 4 biscuits in Roshel's Bakery.

Shop	Price of biscuits
Tammy's Bakery	3 for $13
Roshel's Bakery	4 for $14

1. Mary has $37.20. She wants to buy 16 biscuits from Roshel's Bakery. How much more money does she need to buy the 16 biscuits?
2. Lee has $58. He wants to buy the greatest possible number of biscuits with his money from one of the two shops. What is the greatest possible number of biscuits he can buy with his money?

(a)
Number of sets of 4 biscuits
= 16 ÷ 4
= 4

Cost of 16 biscuits 
= 4 x 14
= $56

Amount that Mary needs more to buy the 16 biscuits
= 56 - 37.20
= $18.80

(b)
Number of sets of 3 biscuits that Lee could buy at Tammy's Bakery
= 58 ÷ 13
= 4 r 6

Number of biscuits that Lee could buy at Tammy's Bakery
= 4 x 3
= 12 

Number of sets of 4 biscuits that Lee could buy at Roshel's Bakery
= 58 ÷ 14
= 4 r 2

Number of biscuits that Lee could buy at Roshel's Bakery
= 4 x 4
= 16 (More)

Greatest possible number of biscuits that Lee can buy with his money = 16

Answer(s): (a) $18.80; (b) 16