In what ratio should rice costing Rs.67.5 per kg be mixed with rice costing Rs.60 per kg to get an average price of Rs.64 per kg?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 8 : 7
Let the ratio be x : y.
ATQ -
67.5x + 60y/(x + y) = 64
67.5x + 60y = 64x + 64y
67.5x - 64x = 64y - 60y
3.5x = 4y
x/y = 4/3.5 = 40/35 = 8/7 = 8 : 7