1 . The cost price of an article A is Rs.160 and selling price of another article B is Rs.288. If the selling price of A will be equal to the cost price of B, then the profit after selling an article A is 20%. What is the profit percentage on article B?
2 . A book consists of 30 pages, 25 lines on each page and 40 characters on each line. If this content is written in another note book consisting of 30 lines and 50 characters per line, then the required number of pages will be how much less than the previous pages?
4 . A can do a piece of work in 10 days, B in 12 days and C in 15 days. They all start the work together but A leaves after 2 days and B leaves 3 days bef ore the work get completed, then in how many days the work got completed?
9 . The angle of elevation of the top of a tower from a point A on the ground is 30°. On moving a distance of 100 metres towards the foot of the tower to point B, the angle of elevation increases to 60°. The height of the tower is: