Numerical Appli...

A can do a piece of work in 40 days. He worked at it for 5 days, then B finished it in 21 days. The number of days that A and B take together to finish the work are

Out of 100 students 50 fail in English and 30 in Maths. If 12 students fail in both English and Maths, then the number of students passing both the subjects is

Find the AM of $$20$$ and $$26$$.

The mean of the following natural numbers $$1, 2,3 ...... 10$$ is

A clocks takes six seconds to strike four how long it will take to strike ten?

If $$35$$ men can reap a field in $$8$$ days; in how many days can $$20$$ men reap the same field ?

In a class there are 18 boys who are over 160 cm tall If these constitute three-fourths of the boys and the total number of boys is tow-third of the total number of students in the class what is the number of girls in the class?

A scanner can print at a rate of $$5$$ pages per minute. Calculate the number of hours will it take to print $$300$$ pages?

$$10$$ pipes fill a tank in $$3$$ hours. How many pipes are required to fill it in $$2$$ hours?

A person crosses a 600 m long street in 5 minutes. what is his speed in km per hour ?