If A, B and C can do a work in 6 days, 9 days and 11 days, respectively, then, working together, how many days will they take to do the work?

Rini has mixed two colours 'C₁' and 'C₂' in the ratio 2 ∶ 3. If the rate of the colour 'C₁' is ₹500 per unit and she is selling the mixture of the two colours at ₹650 per unit at breakeven price, then what is the rate (in ₹) per unit of the second colour, that is, ' C₂'?

In the following figure, the length of arc AB is equal to five times of the radius r of the circle. Find the area of sector AOB?

On selling a painting at Rs. 1,498 , the gain is 25% more than the loss incurred on selling it at Rs.1,300. In order to gain 25%, the selling price will be: