Direction: Study the double bar graph given below and answer the questions.

The class having maximum number of participants in exhibitions:

O and C are respectively the orthocentre and the circumcentre of an acute angled triangle POR. The points P and O are joined and produced to meet the side QR at S. If ∠POS=60⁰ and ∠QCR = 130°, then ∠RPS = ?

If the area of a triangle is 1176 cm² and the ratio of base corresponding altitude is 3 : 4, then the altitude of the triangle is :

A square pyramid with side 10 cm has a volume of 400 cm³. Find the total surface area of the pyramid.

529 mangoes are distributed to Vivek Amit and Ajay in the ratio of $$ {1\over 2},{2\over 3} ,{3\over4}$$ respectively. So tell me how many mangoes Ajay will get?

The average of eleven numbers is 68. The average of the first numbers is 78 and that of the next four number is 63. The 9^th number is two time the 11^th number and the 10^th number is 4 less than the 11^th number. What is the average of the 9^th and 11^th numbers?

A boat is moving away from an observation tower. It makes an angle of depression of 60 ° with an observer's eye when at a distance of 50 m from the tower. After 8 sec, the angle of depression becomes 30 °. By assuming that it is running in still water, the approximate speed of the boat is