The graphs of the equations 3x-20y-2=0 and 11x-5y+61=0 intersect at P(a,b). What is the value of (a² + b² — ab)/(a² — b² + ab)?

The speed of a bus Excluding stoppages, is 80 kmph and including stoppages, it is 72 kmph. For how many minutes does the bus stop per hour?

If an amount doubles automatically in 8 years, then what is the interest rate?

On adding a natural number P to the product of four consecutive natural numbers we get a perfect square number. The minimum value of P is:

If (27x³ – 343y³) ÷ (3x – 7y) = Ax² +By² + 7Cyx, then the value of (4A – B +5C) is:

30 persons can do a piece of work in 24 days. How many more people are required to complete the work in 20 days?

Present age of Ram and Shyam are in the ratio of 4: 5 respectively. Five year hence the ratio of their age becomes 5:6 respectively. What is Ram’s present age?

Ishita can read a newspaper in 'n' minutes. What part of the newspaper can she read in 7 minutes (n>7)