The average mathematics marks of two Sections A and B of class IX 131 the annual examination is 74. The average marks of Section A is 77.5 and that of Section B is 70. The ratios of the number of students of Section A and B is:

If    then the value of a³ + b³ is 

The value of   θθθθθθθθθθ

The area of two equilateral triangles are in the ratio 25 : 36. Their altitudes will be in the ratio : 

The average age of a husband and wife, who were married 4 years ago, was 25 years at the time of their marriage. The average age of the family consisting of husband, wife and a child, born during the interval is 20 years today. The age of the child is:

Find the radius of the circle x²+y²-4x+6y=12

The ratio of the cost price and selling price of an article is 10 : 11. The gain per cent is:

if ,then find the value of