How many kg of rice costing ₹42 per kg should be mixed with$$7{1\over 2}$$ kg rice costing ₹50 per kg so that by selling the mixture at₹ 53.10 per kg, there is a gain of 18%?

A is 80% more than B and C is $$48{4\over 7}\%$$ less than the sum of A and B. By what percent is C less than A?

If (x+20)% of 250 is 25% more than x% of 220, then 10% of (x + 50) is what per cent less than 15% of x?

A certain sum amounts to ₹15,500 in 2 years at 12% p.a. simple interest. The same sum will amount to what in$$1{1\over 2}$$ years at 10% p.a., if the interest is compounded half yearly (nearest to ₹1)?

Pipes A and B can fill a tank in 43.2 minutes and 108 minutes, respectively. Pipe C can empty it at 3 litres/minute. When all the three pipes are opened together, they fill the tank in 54 minutes. The capacity (in litres) of the tank is:

The value of Let $$\left({\sqrt {1875}\over\sqrt { 3888}}÷{\sqrt {1200}\over\sqrt {768}} \right)\ × \left({\sqrt {175}\over\sqrt {1792}} \right)\ $$. Then $$ \sqrt { x}$$ is equal to:

 The area (in sq.units) of the triangle formed by the graphs of 8x+3y=24, 2x+8=y and x-axis is:

The base of a right pyramid is a square of side 10 cm. If its height is 10 cm, then the are (in cm²) of its lateral surface is: