Bijan babu has made phenyl water solution of 60 litres in which the ratio of measurements of phenyl and water is 2:23. Let’s work out how much phenyl should be added to this solution so that the ratio of measurements of phenyl and water becomes 9:46.

The ratio of measurements of water and Dettol in 36 litres of water is 5:1. Let’s work out what volume of dettol should be added to the mixture so that the ratio of measurements of water and dettol becomes 3:1.

In a certain type of brass the ratio of measurements of Copper and Zinc is 5:2. Let’s work out what will be the ratio of Copper and Zinc in 28 kg of brass if 4 kg of Copper is added to it.

Amina Bibi has prepared masonry mixture with sand and cement in a ratio of measurement 7:1. But after the brick-work it is seen that 72 kg of mixture remains. She has added more cement with this mixture and the ratio of measurement of sand to cement becomes 6:1. Let’s work out the total quantity of cement she has mixed.