A can do $$ {4\over 5}$$ of a work in 20 days and B can do $$ {3\over 4}$$ of the same work in 15 days. They work together for 10 days. C alone completes the remaining work in 1 day.  B and C together can complete of $$ {3\over 4}$$ of the same work in:

What is the area of a rectangle , if its diagonal s 61 cm and one of its sides is 11 cm ? 

The ratio of the incomes of two employees is 7 : 4, and the ratio of their expenditures is 3 : 1. If each of them manages to save ₹4,800 per month, find the sum of their monthly incomes (in ₹). 

A boat goes downstream in one-third the time it takes to go upstream. Then the ratio between the speed of boat in still water and speed of the stream is

Two circles of radii 4 cm and 9 cm respectively touch each other externally at a point and a common tangent touch them at the points P and Q respectively. Then the area of square with one side PQ, is:

7 years ago, the ages of A and B were in the ratio of 4: 5 and after 7 years they would be in the ratio of 5: 6. The present age of B is-

The ratio of Volume of two spheres A and B is 8 : 1. The Surface Area of Sphere B is 616 cm². Find the radius of sphere A.

A and B together can do a piece of work in 16 days and B and C together can do the same work in 24 days. From starting A and B worked for 4 days and 7 days respectively, when A lefts the work then C joins the work and he works for 23 days and complete the work. Then find in how many days will C complete the work alone?