[ Mixture and Concentration Problems ]

A merchant has two types of tea: Ceylonese at 10 rubles per pound and Indian at 6 rubles per pound. To increase profit, the merchant decided to mix the two types and sell the mixture at the same price of 10 rubles per pound. In what proportion should he mix them to earn an additional 3 rubles per pound on top of the intended profit?

#
If a merchant sold pure Indian tea at the price of Ceylon tea, he would earn 4 rubles extra profit. Therefore, to earn 3 rubles, he needs to have $3 / 4$ pounds of Indian tea in a pound of the mixture.

## Answer

$1: 3$.