In a class, there are ' z ' students. Out of them ‘x’ are boys. What part of the class is composed of girls? 

If $$ ({x+y\over z})=2$$ , then what is the value of $$ [{ {y\over {y-z}}}] +[{ {x\over {x-z}}}]$$.

The median of a set of 11 distinct observations is 73.2. If each of the largest five observations of the set is increased by 3, then the median of the new set:

The value of a machine depreciates at the rate of 10% per annum. It was purchased 3 years ago. If its present value is Rs.53071.20, the purchase price of the machine was:

The average monthly savings of Shifa for the first 5 months is Rs. 2120, for the next 3 months is Rs. 4260 and for the remaining months of the year is Rs. 3140. Now, the average monthly expenditure for the complete year is Rs. 11000. Find the total income of the year

The following table shows the number of units of product produced and sold by a company during six years.

What is the difference between the number of units produced in 2017 and the number of units sold in 2014? 

Ishita can read a newspaper in 'n' minutes. What part of the newspaper can she read in 7 minutes (n>7)

The ratio of number of boys and girls in a school of 720 students is 7 : 5. How many more girls should be admitted to make the ratio 1 : 1 ?