Total Potatoes sold by farmer = 30 lb
Let the total potatoes be = 1
Remaining left, after 1st sale = 1 - 1/4 = ( 4 - 1 ) / 4 = 3 / 4
Remaining after 2nd sale = 3 / 4 - 1 / 3 = ( 9 - 4 ) / 12 = 5 / 12th
The last, third sale = 10 units
So, equating them : 1 / 3 = 10 units
Total potatoes = 10 x 3 = 30 units
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