If a = 2 , b = ­3 then the value of 27a3 - 54a2b + 36ab2 - 8b3 is

If x+19x=4, then 9x2+19x2 is

The time taken by a train 160 m long, running at 72 km/hr, in crossing an electric pole is

A person loses 75% of his money in the first bet, 75% of the remaining in the second and 75% of the remaining in the third bet and returns home with Rs. 2 only. His initial money was

An article was sold at Rs. 950 allowing 5% discount on the marked price. The marked price of the article is

A man spends a part of his monthly income and saves the rest. The ratio of his expenditure to the saving is 61 : 6. If his monthly income is Rs.8710, the amount of his monthly savings is

The list price of an article is Rs. 900. It is available at two successive discounts of 20% and 10% . The selling price of the article is:

A can do a piece of work in 18 days. He worked at it for 12 days and B finished the remaining work in 8 days. B alone can do the whole work in