Given that one regular cone uses 2 scoops of icecream
Richard scooped 234 regular cones
so amount of scoope in regular cones = 2*234 scoops.
Given that one large cone uses 3 scoops of icecream
Richard scooped 156 large cones.
so amount of scoope in large cones = 3*156 scoops.
Total scoops used = 2*234+3*156= 468+468= 936 scoops
Given that one scoop of ice cream = 3 ounce
then 936 scoops = 936*3 ounce = 2808 ounce
Given that 1 tube contains 10 pounds.
There are 16 ounces into 1 pound
so that means 1 tube contains 10*16= 160 ounce.
Now we want to calculate numbe of tubes used
so we will divide weight of total used scoops by weight of 1 tube
which is 2808/160 =17.55
Hence answer is approx 18 tubes.