If 999x + 888y = 1332 and 888 x + 999y = 555.then the value of (x + y) is-

Two equal circles of radius 4 cm intersect each other such that each passes through the center of the other. The length of the common chord is

If the angle of the elevation of sun is θ and the length of the shadow of a pole of length P is S, then 

A bar graph showing the height of six mountain peaks. Study the bar graph and answer the following Questions.

Which peak is the second highest?

In the first 10 overs of a cricket game, the run rate was only 3.2. The run rate in the remaining 40 overs to reach the target of 282 runs is –

If the product of four consecutive natural numbers increased by a natural number p, is a perfect square; then the value of p is: 

If $$ {a^4+1}={{a^2}\over{b^2}}{(4b^2-b^4-1)}$$,then what is the value of $${a^4+b^4}$$?

An article is sold Rs.680 after two successive discounts of 20% and x% on its marked price. The marked price of the article is Rs.1000. What is the value of x?