There are some coins and rings of either gold or silver in a box. 60% of the objects are coins, 40% of the rings are of gold and 30% of the coins are silver. What is the percentage of gold articles?

380 mangoes are distributed among some boys and girls who are 85 in numbers. Each boys gets four mangoes and each girls gets five. The number of boys is : 

One angle of pentagon is 140°. If the remaining angles are in the ratio 1 : 2: 3: 4, the size of the greatest angle is:

The cost price of an article is 480. If it is to be sold at a profit of 6.25 %, how much would be its selling price? 

A train travelling at a constant speed crosses a pole in 12 seconds whereas cross a tunnel 198 metre long in 30 seconds. Find the length of train.

The smallest number which should be added to the number 8958 so that the result is a perfect square is 

Ram and Shyam can do a work in 12 days, Shyam and Hari in 15 days, and Hari and Ram in 20 days. Accordingly, in how many days can Rama alone complete that work?

A loss of 19% gets converted into a profit of 17% when the selling price is increased by Rs. 162. The cost price of the article is