Quantitative Ap...

A mixture of 20 litres of alcohol and water contains 15% of alcohol. How much alcohol should be added to the mixture so that the mixture contains 20% of alcohol.

A and B can do a work alone in 12 days and 8 days respectively. They undertook to do a work together, but B left the work after 2 days. Then, the remaining work was completed by A together with C in 3 days. If C got Rs. 600 as his share, for how much money did they undertook to do the work?

\(3\) years ago, the ratio of Maya's and Shika's age was \(5: 9\) respectively. After 5 years, this ratio would become \(3: 5\). Find the present age (in years) of Maya.

What will come in the place of the question mark ‘?’ in the following question?

In the year 2015, Rakesh invested 50% of his saving in the stock market, where he earned a profit of 300%. What was the profit?

According to a non-government company if a person save at least 27% of his salary in a year that year can be called as “a year of investment”. How many years are “a year of investment” during the given period?

Find in which year the percentage increase in the salary of Rakesh was maximum.

Find by what percent the salary of Rakesh was increased in 2016 over 2012.

Find the compound annual growth rate (CAGR) of the salary of Rakesh during 2011-16. (Given:$9^{\frac{1}{5}}$ = 1.55)

A pipe can fill a tank in \(\mathrm{2 0}\) minutes. Another pipe can empty that tank in \(\mathrm{3 0}\) minutes. If both are opened alternatively, how long will it take to fill the tank?