Two cans A and B contains milk worth Rs.7 per litre and Rs.9 per litre respectively. If the contents of A and B are transferred to another can C in the ratio 3 : 7 then the cost per litre of the mixture in can C is:
Cost of 1 litre of A = Rs.7 = cheaper quantity.
Cost of 1 litre of B = Rs.9 = dearer quantity.
Let the mean price be Rs.x
Applying the rule of alligation,Therefore, (Cheaper quantity) (Dearer quantity) = (d - m) : (m - c) = (9 -x ) : (x - 7)
Given ratio = 3 / 7 = 9 - x/ x- 7
63 – 7x = 3x - 21
x = 8.4.
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