If the price of petrol is reduced by 10%, by how much should a consumer increase the consumption of petrol so that his expenditure on petrol does not decrease?

The number of girls in a class is 20% more than the number of boys. There are total 66 students in this class. If 4 more girls are admitted in the class, then the ratio of the number of boys and girls will be?

The selling price and the cost price of an article are ₹6,000 and ₹5,000, respectively. What is the profit percentage?

In what ratio is the segment joining (-1,-12) and (3,4) divided by the x-axis?

$$\left({?-0.5\over 0.2} \right)={120\over 2}$$

A factory buys 7 machines. 2 Machine A, 2 Machine B and rest Machine C. Prices of the machines are Rs 95000, Rs 75000 and Rs 43000 respectively. Calculate the average cost of these machines?

The annual income of A and B Aare in the ratio 4: 3 and the ratio a of their expenditures is 3 : 2. If each of them saves ₹ 600 in the year, the annual income of A is 

0.15% of $$33{1\over 3}\%$$ of ₹ 10000 is :