For the following questions answer them individually
A sum of money doubled itself at certain rate of compound interest in 15 years. In how many years will it become four times of itself?
If the length of a rectangle is increased by 80%, what would be the percentage decrease (correct to one place of decimal) in the width to maintain the same area?
A sum of money is distributed among P, Q, R and S in the ratio 3 : 4 : 5 : 6, respectively. If R gets ₹500 more than Q, then the sum of all their shares (in ₹) is:
Study the following graph that shows the number of boys and girls who appeared for the Class X examination in a school XYZ, in different years.
What is the ratio of the total number of boys who appeared for the Class X examination in 2012 and 2013 to that of girls who appeared in 2012 and 2015?
A car travels a distance of $$x$$ km at a speed of $$5\frac{5}{9}$$ m/sec and returns at 5 m/sec to the starting point. If the total time taken by the car is $$7\frac{3}{5}$$ hours then the value of $$x$$ (in km) is:
There are three positive numbers. If the average of any two of them is added to the third number, the resulting sums are 154, 148 and 131. The average of the original three numbers is:
Study the following graph that shows the number of boys and girls who appeared for the Class X examination in a school XYZ, in different years.
The average of the number of boys who appeared in 2011, 2013 and 2015 is what percentage less than the number of girls who appeared in 2012 (correct to one decimal place)?
'A' can complete a work in 15 days and 'B' can complete the same work in 20 days. Working together, in how many days, will they complete 35% of the same work?
The ratio of the speeds of two trains is 5 : 8. If the second train runs 400 km in 4 hours, then the speed of the first train (in km/h) is: