Question

Farmer Bill sold potatoes at the farm market. He sold a quarter to the first person, 4/9 of what was left to the second person, and the third buyer bought 4/5 of what was left and the last 10 lb. How many pounds of potatoes farmer Bill sold?

Answer 1

Bill sold in total 12 pounds of potatoes. 

Answer 2

10*9=90
3u->90
1u->30
4u->120 pounds