The value of an article depreciates every year at the rate of 10% of its value. If the present value of the article is  Rs 729, then its worth 3 years ago was

If a+b+c=15 and a²+b²+c²=83 then the value of a³+b³+c³-3abc

A and B can complete a work together in 48 days. A is 4 times as work efficient as B. In how many days can B alone complete the work?

Two casks of 48 liter and 42 liter are filled with mixtures of milk and water, the proportions in the two casks being respectively 13 : 7 and 18 : 17. If the contents of two casks be mixed and 20 liter of water be added to the whole , what will be the proportion of milk and water in the resulting mixture ?

Find mean of first five prime number.

The Garibrath express can move at 45 km./hr. without its rake and the speed is diminished by a constant that varies as the square root of the number of wagons attached. If it is known that with 9 wagons, the speed is 30 km./hr., what is the greatest number of wagons with which the train can just move?

The total surface area of a cube is 864 square cm. What is his volume?

Each member of a club contributes as much rupees and as much praise as the number of members of the club. If the total contribution is ₹2525, then the number of members of the club is: