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Let, present ages of A and B be ‘7x’ years and ‘5x’ years respectively. So, 7x + 3 = 36 – 12 7x = 21 x = 3 Present age of B = 5x = 15 years
In a city, the number of persons travelling by bike is 52.5% the number of persons travelling by metro. The number of persons travelling on foot is 60% ...
A student multiplied a number by 8/5 instead of 5/8. What is the percentage error in the calculation?
In how many months will Rs 8,000 yield Rs 2,648 as compound interest at 20% per annum compounded semi-annually?
A racing car going at an average speed of 108 km/hr takes 15 minutes to complete a lap on a racing track. By how much should it increase its speed (in ...
In a colony, there are 120 APL families and 54 BPL families. Each APL and BPL family got blankets equal to 15% and 75%, respectively of total number of ...
A number is increased by 45% and then decreased by 30%. What is the overall percentage change (increase or decrease) in the number?
A car's value decreases by 20% every year. If the car was purchased for Rs 3,30,000, what will be the total percentage decrease in its value over a 3-ye...
Anuj allocates 45% of his income towards rent, and then spends 60% of the remaining amount on his studies. After these expenses, he saves Rs. 1650. Wha...
A towel was 75 cm long and 120cm broad. When bleached, it was to have lost 40% of its length and 20% breadth. The percentage of decrease in area is:
A district has 10,24,000 inhabitants. If the population increases at the rate of 2.5% per annum, find the number of inhabitants at the end of three years