In what ratio must two sorts of sugar, costing 390 and 315 per kg respectively, be mixed in order to produce a mixture worth 69 per kg
Let the ratio in which the two types of sugar are mixed be x:y.
The cost of the first type of sugar is 390 per kg and the cost of the second type of sugar is 315 per kg. The cost of the mixture is 69 per kg.
Therefore, according to the given conditions:
(390x + 315y) / (x + y) = 69
Solving the above equation will give the ratio in which the two types of sugar should be mixed.