Aparna changes the marked price of an item to 50% above its C.P. What % of discount allowed in approximately to gain 10%?

A solid sphere of diameter 17.5 cm is cut into two equal halves. What will be the increase (in cm²) in the total surface area?

What value will come in place of question mark (?) in the questions given below?

663.48 + 22.51 - 292.63 = ? + 300.44 

In the triangle ABC, AB = 2 cm, BC = 3 cm and AC = 4 cm. D is the middle point of AC. If a square is constructed on the side BC, what is the area of the square?

Kundan, Dharma and Guard start a venture together. Dharma and Guard invest 4,000 and 3,000 respectively while Kundan invests 1,000 initially and after 6 months withdraws his capital and decides to work as working partner with 30% stake in the profit. If Kundan gets 800 at the end of the year, what was the total profit? 

If $$ {4p\over{{p^2}}-4p+4}={1\over8}$$, p≠0 then the value of $$ {p+{4\over p}}$$

If $$ P={{x^2-36}\over{x^2-49}}$$ and $$ Q={{x+6}\over{x+7}}$$ then the value of $$ {P\over{Q}}$$ is.

If $$ {x=a^{2\over3}-a^{-2\over3}}$$ then the value of $$ {x^{3}+3x}$$.