A single discount equivalent to two successive discounts of $$ {12{1\over 2}}{\%}$$ and 20% is

Direction: The following table shows the number of students of 7 colleges A, B, C, D, E, F, G participating in extra-curricular activities :

Percentage of the number of students in activity II to that of IV 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 ratio of number of students appearing tor competitive exam from city B to number of students appearing for competitive exam from city A? 

The ratio of present ages of Shankar and Mohan is 7: 8 respectively. Four year hence this ratio becomes 9: 10 respectively. What is Shankar’s present age in years?

A sum of ₹14,375, when invested at r% interest per year compounded annually, amounts to ₹16,767 after two years. What is the value of r?

The mean of 20 items is 55. If two items 45 and 30 are removed, what will be the new mean of the remaining items?

The value of $$ {\sqrt{x^{2}y}\over{\sqrt{xy^{2}}}}×\sqrt{y\over{x}}$$ is

In how many years will Rs 2000 become Rs 2420 at 10 percent compound annual interest?