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A chemical solution appears green when the salt concentration is 8 grams per litre (gpl) and red when it is 10 gpl. Pure water was added to the solution of 1 litre of 15 gpl solution till it turned green. Then 125 ml of the green solution is taken out and x grams of salt is added to the green solution to make it red. Another 500 ml of the final solution was taken out and y litres of green solution is added to get a resultant solution of concentration 9.6 gpl.  Assume adding salt doesn’t change its volume and find the ratio of x and y. 
Arjun buys milk at Rs. 30 per liter. He sells his milk in a 5 liter can in which he adds 1 liter water and the rest milk. If a liter of water costs Rs. 5 and he sells a can for Rs. 150, find his profit percentage in selling a 5 liter can?
Shyam is a greedy shopkeeper who always cheats in his dealings. He uses a faulty machine which reads 500 grams as 580 grams. A customer bought 500 grams of rice but instead of 500 grams he had to pay for 580 grams. Calculate the profit/loss percent of Shyam if the cost price and selling price of rice is Rs. 20/kg and Rs. 30/kg respectively. 
250 grams of a sweet has 20 grams of cashew and 30 grams of almonds. How many grams of cashew and almonds, respectively, will be there in 350 grams of the same sweet?
What is the molar concentration of a solution with 32 grams of CH4 in 1 liter solution?
What is the molar concentration of a solution with 44 grams of CO2 in 0.5 liter solution?
What is the molar concentration of a solution with 32 grams of SO2 in 0.5 liter solution?
A man buys 45 liters of petrol for Rs. 62 per liter and 30 liters of kerosene at Rs. 25 per liter. He mixes both and then sells the mixture mentioning it as petrol. At what price must he sell each liter to get a profit of 30% on each liter he sells?
A solution with density 1 g/cm3 has 98 grams of H2SO4 in 402 grams of water, what is the concentration of solution?
A container has O2 at 5 atm and molar volume 2 liter/mole, if a = 9.24 atm(liter/mole), b = 0.0907 liter/mole, what is the temperature of O2? (Use vander waal equation)