A chord of length 16 cm is drawn in a circle of radius 10 cm. The distance of the chord from the centre of the circle is

If pq (p+q) = 1, Then the value of 1/p³q³ -p³-q³ is equal to 

If x² + 1/x² = 2, then the value of x - 1/x is

The price of an article is decreased by 10%. To restore it to its former value, the new price must be increased by :

A T.V was sold at a profit of 5% If it had been sold at a profit of 10% , the profit would have been Rs. 1000 more. What is its cost price

The average monthly salary of 19 members of a group is Rs. 16000. If one more members whose monthly salary is Rs. 20000 has joined the group, then the average salary of the group is