A shopkeeper bought 840 kg of rice. A part of it was sold at 25% profit and the remaining at 10% loss and on the whole, the profit was 15%. What was the quantity of rice which was sold at 10% loss?

240 kg

The original quantity of the rice = 840

Using allegation,

25%                                 (-10%)

                      15%

25                   :                  10   (Ration of quantity)

25 + 10 = 840

1 = \(\frac{840}{35}\)

10 = 240 kg