Question

You can buy three sandwiches for $4.95 or for sandwiches for $6.42 which is the better buy

Answer 1

4.95 / 3 = 1.65 per sandwich

6.42 / 4 = 1.61 per sandwich

so the better buy would be the (four) sandwiches for 6.42

Answer 2

4 sandwiches would be the better deal