The average per day income of A, B and C is Rs. 450. If the average per day income of A and B be Rs. 400 and that of B and C be Rs. 430, the per day income of B is: 

The present age of a father is 3 years more than three times the age of his son. Three years hence, father's age will be 10 years more than twice the age of the son. The father's age is: 

The average weight of three men A, Band C is 84 kg. D joins them and the average weight of the four becomes 80 kg. If E whose weight is 3 kg more than that of D, replaces A, the average weight of B, C, D and E becomes 79 kg. The weight of A is: 

of the three numbers, the first is 3 times the second and the third is 5 times the first. If the average of the three numbers is 57, the difference between the largest and the smallest number is: 

A number, on subtracting 15 from it reduces to its 80 %. What is 40 % of the number? 

A number is divided into two parts in such a way that 80% of 1^st  part is 3 more than 60% of 2nd part and 80% of 2nd part is 6 more than 90 % of the 1st part . Then the number is: 

One of the four angles of a rhombus is 60°. If the length of each side of the rhombus is 8 cm, then the length of the longer diagonal is 

The perimeter of a rhombus is 100 cm, if one of its diagonals is 14 cm. Then the area of the rhombus is