The angles of elevation of the top of a tower as observed from the bottom and top of a building of height 80 metre are 60° and 45° respectively. The distance of the base of the tower from the base of the building is:-

What is the value of x $$ {0.081\over x}={0.09\over10}$$ ?

A boat takes 16 minutes and 24 minutes to cover a certain distance downstream and upstream, respectively. If the speed of the boat in still water is 15 km/h, find the speed of the stream.

15 person can complete a work in 60 days. If the number of persons is increased by 5, how many days earlier will the work get completed?

Directions: Each of the questions consists of a question followed by three statements. You have to study the questions and the statements and decide which of the statements(s) is/are necessary to answer the question. 

What was the percentage of discount offered?
 I. Profit earned by selling the article for Rs. 252 after giving discount was Rs. 52.
 II. Had there been no discount the profit earned would have been Rs. 80
 III. Had there been no discount the profit earned would have been 40%.

Ramesh stands 40 meters away from the foot of a tower, if the angle of elevation of the sun is 60 degrees at that point, what will be the height of the tower?

Cost of a diamond varies directly as the square of its weight. A diamond broke into four pieces with their weights in the ratio 1 : 2 : 3: 4. If the loss in the total value of the diamond was Rs.7000, the price of the original diamond was

Directions:  Study the bar-graph given below & answer the questions.
Pie-chart given below shows the percentage distribution of total no. of boys in six different Schools.
Total Boys in all schools together = 6400

If number of boys in school A and school D together is 2/5 th of the total students in both schools then find difference of girls in school A and school D?