The tank full of petrol in Haroon�s motorcycle lasts for 10 days, if he starts using 25% more every day for how many days will the tank full of petrol last?
If the price of petral is increased by 20% by what percentage should the consumption be decreased by the consumer if the expenditure on petrel remains unchanged?
In a survey it was found that 80% of those surveyed owned a car while 60% of those surveyed owned a mobile phone, if 55% owned both a car and a Mobile phone, What percent of those surveyed owned a car or a mobile phone or both?