Directions: The bar graph shows the results of an annual examination in a secondary school in a certain year. Answer the following four questions based on this chart.

The average number of boys passed per class is 

Answer the following questions

Manoj gave 60% of his salary to his wife and invested rest amount in mutual funds. His wife spends 30% amount on grocery and 20% on rent. From remaining amount, she purchased gold worth Rs. 18000. Find salary of Manoj.

A vessel contains some litres of pure milk. If 25 litre of water is added to the vessel, then ratio between milk and water becomes 12:5, 17 litres of mixture is drawn from the vessel and 10 litre of water is added to the mixture. Find the new ratio between milk and water.

The sum of three numbers is 252. If the first number is thrice the second and third number is two-third of the first, then the second number is

If a(tanθ+cotθ)=1, sinθ+cosθ=b and 0°<θ<90°, then the relation between a and b.

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 ratio of girls to total students in school E is 3 : 5. Then find difference of boys in school D to girls in school E?

Simplify $$ {^3\sqrt {{4} {12\over {125}}}}$$.

The ratio of investment of two partners is 11: 12 and the ratio of their profits is 2: 3. If A invested the money for 8 months, find for how much time B invested his money?