How many kilogram of salt worth ₹$360$/kg should be mixed with $10$Kg of salt worth ₹$420$/kg, such that by selling the mixture at ₹$480$/kg, there may be a gain of 20%?

A tank contains of  $500$ liters of wine. $50$ liters of wine is taken out of it and replaced by water. This process is again repeated. Find the proportion of water and wine in the resulting mixture.

A man purchased a table and a chair for ₹$2000$ . He sold the table at a profit of  $20$% and the chair at a profit of  $40$%. In this way, his total profit was $25$%. Find the cost price of the table.

A tank has a capacity of $10$ gallons and full of his alchol $2$ gallons of alchol are drawn out and the tank is again filled withwater.This process is repeated $5$ times .Find out how many alchol is left in the resulting mixture finally?

A vessel is full of milk $\frac{1}{4}$ of the milk is taken out and the vessel is filled with water. If the process is repeated $4$ times and$100$ litres of milk is finally left in the vessel, what isthe capacity of vessel?

In what ratio should two qualities of tea having the rates of $₹40$/kg and $₹$$30$/kg be mixed in order to get a mixture that would have a rate of $₹$$35$/kg?