If the efficiency of Q increases by $$ {33{1\over 3}{\%}}$$ and P and Q start to work together, while at the same time R starts destroying the work. Find in how many days work will be completed.

The average of 8 numbers is 38.4. Out of these numbers, the average of 7 number is 39.2. The 8th numbers

The simplified value of
$${{1\over 3}÷{1\over 3}×{1\over 3}\over{1\over 3}÷{1\over 3}of{1\over 3}}-{1\over 9}$$

If $${x}^2+{y}^2x+1=0$$ then the value of $$x^{31}+y{35}$$ is

200 meter long train crosses a bridge with the speed of 54 km/hrs. in 30 sec. Find the length of bridge?

The item costing Rs. 840 was sold by A shopkeeper at a gain of 10% and it was again sold by the new buyer at the loss of 5%. find the selling price of the item is

If A works alone, he would take 4 days more to complete the job than if both A and B worked together. If B worked alone, he would take 16 days more to complete the job than if A and B work together. How many days would they take to complete the work if both of them worked together?

The ages of Bholu and Nitesh are in the ratio of 8 : 7 respectively. After 6 years, the ratio of their ages will be 19 : 17. What is the difference in their ages?