Answer:
2.25 + 1 1/3=3.5833333 combined number of pounds of mulch and gravel sold.
2.25/3.583333 X 172=108 pounds of mulch that the supplier sells
(1 1/3) / 3.583333 X 172=64 pounds of gravel that the supplier sells.
Step-by-step explanation:
Let 'x' = pounds of gravel     The ratio of mulch to gravel is given  2 1/4  /  1 1/3  Which equals  9/4  /  4/3   =  27/16
So the total gravel and much is equal to  x + 27/16x = 172 Â
Solving for 'x'
43/16 x = 172 Â Â
x = 172 (16/43) = 64 pounds of gravel  Mulch = 27/16x = 64 (27/16)= 108 pounds