2 days later, 4/5 rice left, that means Mdm Rai used up 1/5 of rice in 2 days.
–> So 1/10 of rice is used each day.
After 2+5 days later, 6kg left.
–> As 1/10th of rice is used each day, 7/10th of rice will be over after 7 days. So left over is 3/10th of rice.
Left over – 6Kg = 3/10th of rice.
3 units = 6kg; So one unit = 2kg.
So 10 units (total rice at first) = 2 X 10 = 20kg.
Hope that clarified.
Automated School Test Papers – www.Practice-PaperLess.com