The smallest number that must be subtracted from 1000 to make the resulting number a perfect square is 

Two buses travel to a place at 45 km/hr and 60 km/hr respectively. If the second bus takes 5½ hours less than the first for the journey, the length of the journey is:

Simplify : $$ {(2x)^{2}-(2y)^{2}-(4x)^{2}}$$

Direction: Study the following graph and answer the given question.

What was the difference between the average amount invested in raw materials during the given period and the average value of sales of finished goods during this period?

If N:38∷ 3:57, Find N.

The least multiple of 7, which leaves the remainder 4, when divided by any of 6, 9, 15 and 18, is 

What value will come in place of question mark (?) in the questions given below?
6⁹ × 36 ÷ 7776 = 6^? ÷ 216 

A can do a work alone in 30 days. He left after doing half the work. If B alone can complete the entire work in 16 days, then how many days will B take to complete the remaining work?