###Human: Ryan wants to take 5 peanut butter sandwiches to the beach.  If each sandwich consists of 3 slices of bread how many slices does Ryan need to make 5 sandwiches?, ### Assistant: To make 1 sandwich, you need 3 slices so Ryan needs 1*3= 3 slices to make one sandwich.
Since it takes 3 slices to make a sandwich, and Ryan wants 5 sandwiches to take to the beach he needs 3*5= 15 slices. 
 So the answer is :  15