Hard
In what proportion should a shopkeeper mix wheat at Rs 20.4 per kg and Rs 28.8 per kg to get a Rs 25.2 per kg wheat?
Explanation
Explanation
Using the rule of alligation: ratio = (28.8-25.2) : (25.2-20.4) = 3.6 : 4.8 = 3:4.
PRO TIP
Re-check your working by substituting the answer back into the original question.