9. The cost
of type 1 rice is Rs 15 per Kg and type 2 rice is Rs 20 per Kg. If both type1
and type 2 are mixed in the ratio of 2:3,then the price per Kg of the mixed
variety of rice is?
Solution: Let the
price of the mixed variety be Rs x per Kg.
Cost
of 1 Kg of type 1 rice Rs 15 Cost of 1
Kg of type 2
rice
Rs 20
Mean Price Rs x
20-x x-15
(20-x)
/( x-15) = 2/3
=>
60-3x = 2x-30
5x
= 90=>x=18.
