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Hi 

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.


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