Find the area of a white sheet required to prepare a cone with a height of 21cm and the radius of 20cm.

A, B and C contract a work for Rs. 550. Together A and B are to do 7/11 of the work. The share of C should be?

The No. of mangoes on three baskets are in the ratio of 3 : 5 : 7. In which ratio the no. of mangoes in first two baskets must be increase so that the new ratio becomes 5 : 6 : 8.

Income of A and B are in ratio 3:4 and their expenditure are in ratio 4:7 their saving are equal if A save Rs 1760 more and B increase his expenditure by Rs 880 then their saving are in ratio 7:4 .find the average income of A and B?

If the radius of a circle is decreased by 50%, its area is reduced by

If the ratio of two numbers is 13 : 15 and their L.C.M. is 39780. Then the numbers are?

When n is divided by 6, the remainder is 4. When 2n is divided by 6, the remainder is : 

A number x when divided by 289 leaves 18 as the remainder. The same number when divided by 17 leaves y as a remainder. The value of y is