$216
20=$24
20*3 $24*3
60=$72
*3 *3
180=$216
(180=3 hours)
Answer:
Step-by-step explanation:
4xy+13x
5xy+7x+6x-xy
5xy-xy=4xy
7x+6x=13x
5xy+7x+6x-xy=4xy+13x