You are given that "type A recoveries" cost 2.25 times as much as "type b recoveries"? Okay, let "B" represent the cost of a single "type B recovery". The cost of a single "type A recovery" will be 2.25B. There were 7 "type A" recoveries so the total cost of "type A" recoveries will be 7(2.25 B)= 15.75 B. There were two "type B recoveries" so the total cost of "type B recoveries" would be 2B. The total cost would be 15.75B+ 2B= 17.75B= 18000. Can you solve for B and then A?