Mathematical Sk...

The ratio of the numbers of boys and girls in a school having 720 students is 7 : 5. How many more girls should be admitted to make the ratio 1 : 1?

Jalal, Amit and Feroz enter into partnership. Jalal invest$4$ times as much as Amit and Amit invest $\frac{3}{4}$ of what Feroz invests. At the end of the financial year, the total profit earned is Rs. $19000$. Find the share for Jalal?

The difference of simple interest obtained on 22% per annum and 20% per annum of a sum in 1 year is Rs. 140. Find the sum.

The speed of a boat along the current of stream is 15 km/h and the speed of current is 3 km/h. Find the total time taken to cover 18 km against the current of stream and 18 km along the current of stream.

A piece of work can be completed by P and Q in 10 and 15 days respectively. In how many days the work would be finished if P and Q working on alternate days and P begins the work?

At what rate percent per annum simple interest will a certain sum of money double itself in$15$ years?

If the cost price of 48 articles is equal to the selling price of 32 articles, then what is the profit percent?

A, B and C can do a work in 20, 30 and 60 days respectively. If total Rs, 3000 is given to them, then find their individual share.

One of the angles of a triangle is \(\frac{1}{2}\) radian and the other is 99°. What is the third angle in radian measure?

A water cooler is filled when it is half empty with the help of a pipe which can fill the whole cooler in \(\frac{50}{3}\) minutes. There is an outlet tap at the bottom of the cooler which can empty the tank in 25 minutes. When the inlet pipe is started, a person comes and takes out the water from that tap for 1 minute then after a gap of 2 minutes another person comes and takes out the water for 1 minute and this process goes on. In how much time cooler will be completely full?