Question

In what ratio must coffee at rs 93 per kg be mixed with coffee at rs 108 per kg so that the mixture be worth rs 100 per kg?

Answer 1

let x kg of 93Rs/kg and y kg of 108Rs/kg

93x+108y = 100(x+y)
93x+108y= 100x+100y
8y= 7x

x:y = 8:7