In a mixture of milk and water, the proportion of milk by weight is 60%. If from the 80 gm mixture, 20 gm of mixture is taken out and 6 gm of pure water is added to the mixture, then find the ratio of milk and water in the new mixture.
A salesman sells two shirts at BDT 594 each. On one he gains 10% and on the other, he loses 10%. Find his gain or loss percent on the whole.
A solution made up of 40% alcohol by volume is mixed with 4 liters of solution that is 10% alcohol by volume. How much, in liters of the 40% alcohol solution is needed to make a mixture that is 25% alcohol by volume?
If 24 machines can make 5 devices in 30 minutes, how many hours will it take 4 machines to make 15 devices?
An equilateral triangle is inscribed into a circle with radius 10cm. What is the area of the triangle?