80% of a number added to 80 gives the result as the number itself, then the number is :

Two tailors X and Y are paid a total of Rs. 550 per week by their employer. If X is paid 120 percent of the sum paid to …

Nandini Basu bought an article for Rs. 5844. She gave Rs. 156 to a mechanic to remove its defect. She then sold it for R…

A book consist of 30 pages, 25 line on each page and 35 characters on each line. If this content is written in another n…

One bacterium splits into eight bacteria of the next generation. But due to environment, only 50% of one generation can …

A student multiplied a number by $$\frac{3}{5}$$ instead of $$\frac{5}{3}$$. What is the percentage error in the calcula…

From 5 litres of a 20% solution of alcohol in water, 2 litres of solution is taken out and 2 litres of water is added to…

What is the percentage change in the result when we add 50 to a certain number x, instead of subtracting 50 from the sam…