If l + m + n = 9 and l2+m2+n2 = 31, then the value of lm + mn + nl will be

If 2pp2-2p+1 = 14, then the value of (p + 1/p) will be

In what time will a 100 metre long train running with a speed of 50 km/hr cross a pillar?

In a city, 40% of the people are illiterate and 60% are poor. Among the rich, 10% are illiterate. The percentage of the illiterate poor population is

A trader sold a cycle at a loss of 10%. If the selling price had been increased by Rs. 200, there would have been a gain of 6%. The cost price of the cycle is

The diameters of two cylinders are in the ratio 3:2 and their volumes are equal. The ratio of their heights is

A and B together can do a piece of work in 9 days. If A does thrice the work of B in a given time, the time A alone will take to finish the work is

Which Institution has the final authority to interpret the Constitution of India?