An umbrella is marked for ₹150 and sold for ₹138. The rate of discount is:

When a shopkeeper sells an item for Rs 230, he loses 20 percent. If he sells the item for Rs. 339.5, what percentage of profit will he make?

If $$ {a={1+x\over 2-x}}$$, then find the value $$ {1\over {a+1}}+{2a+1\over{a^{2}-1}}$$ ?

If books bought at prices from ₹150 to ₹ 300 are sold at prices ranging from ₹ 250 to  ₹350, what is the greatest possible profit that might be made in selling 15 books ?

The HCF of three numbers 98, 175 and 210 will be:

If 15x² – 26x + 8 = (Ax + B) (Cx + D), where A and C are positive integers, then what is the value of (2A + B – C – 2D) ?

What is the volume of a cylinder if the radius of the cylinder is 10 cm and height is 20 cm? (Take π = 3.14)

Some men can do a piece of work in 60 days. If there are 8 more men, the work can be completed in 10 days less. What was the number of men in the beginning?