The ratio between the third proportional of 12 and 30 and mean proportional of 9 and 25 is

P can do a task in 30 days, Q is 50% more efficient than P, R can do the same work in 10 days less than Q if R and Q start task together and after X days they left the task and P completed the remaining task in (X + 8) days. then find the value of X?

The product of two numbers is 2028 and their HCF is 13. The number of such pair is-

Direction: Study the following graph and answer the questions based on it.

The ratio of total production of fertilizers in the year 1996 and 1997 to that of total production in the year 1995, 1998 and 2000 is 

A train running at the speed of $${140\over 9} $$  m/sec, crosses a pole in 27 sec. Find the length of the train.

Which of the following is the largest fraction   $${6\over7},{5\over6},{7\over8},{4\over5} ?$$ 

Running at a speed of 60 km per hour, a train passed through a 1.5 km long tunnel in two minutes, what is the length of the train?

Find the exact value of the following question:

$$ 8\sqrt{?}÷14×3+9=21$$