Numerical Appli...

Computer K can perform $$x$$ calculations in $$y$$ seconds and computer L can perform $$r$$ calculations in $$s$$ minutes. Find the number of calculations they can perform in $$t$$ minutes by working together simultaneously.

The monthly fees for single rooms at $$5$$ colleges are $$370$$, $$310$$, $$380$$, $$340$$, and $$310$$, respectively. What is the mean of these monthly fees?

What is the average(arithmetic mean) of all the multiples of ten from $$10$$ to $$190$$ inclusive?

A car owner buys petrol at Rs.7.50, Rs. 8 and Rs. 8.50 per litre for three successive years. What approximately is the average cost per litre of petrol if he spends Rs. 4000 each year?

A square pyramid is inscribed in a cube of total surface area of $$24$$ square cm such that the base of the pyramid is the same as the base of the cube. What is the volume of the pyramid?

January 1, 2007 was Monday. What day of the week lies on Jan. 1, 2008?

The amount of time taken to paint a wall is inversely proportional to the number of painters working on the job. If it takes 3 painters 5 days to complete such a job, how many days longer will it take if there are only 2 painters working?

Let $$\boxed { n }$$ be defined as $$\frac{(n+2)!}{(n-1)!}$$, what is the value of $$\frac{\boxed{7}}{\boxed {3}}$$ ?

If the average arithmetic mean of 8, 12, 15, 21, x and 11 is 17 then what is x?

What is the average of four tenths and five thousandths?