If certain sum, at simple interest turns into thrice of actual amount in 4 years. Find out time to become the amount thirteen times of initial amount? 

A sum amounts to ₹ 6480 in 4 years and ₹ 9600 in 8 years when it is compounded annually. Find the sum?

The difference of two numbers is 15 % of their sum. the ratio of the larger number to the smaller number is: 

If the positions of the digits of a two-digit number are interchanged, the number obtained is smaller than the original number by 27. If the digits of the number are in the ratio of 1 : 2, what is the original number? 

If a : b=2 : 5, b:c=4 : 7 and c : d=9 : 14, then Find out the value of a : b : c : d=?

A rectangular sheet of metal is 40 cm by 15 cm. Equal squares of side 4 cm. are cut off at the corners and  the remainder is folded up to form an open rectangular box. The volume of the box is-

Read the following graph carefully and answer the related questions-

Total number of students (in thousands) participating in comitative exam in various cities.

What is the average number of students appearing in competitive exam from all the states together? 

What is the greatest number which will divide 110 and 128 leaving a remainder 2 in each case?