গণিত MCQ
A dishonest milkman professes to sell his milk at cost price but he mixes it with water and thereby gains 25%. The percentage of water in the mixture is-
সঠিক উত্তর
20%
⇒ Quantity of water : Quantity of milk = (1 - 4/5) : (4/5 - 0) = 1/5 : 4/5 = 1 : 4Hence, percentage of water in the mixture = (1/5) × 100% = 20%