1.

1). 2 : 52). 1 : 33). 5 : 34). 4 : 3

Answer»

First of all, we use given quantities and PLACE them in the formula, to know the required quantities.

Cost of 1 litre milk of 1ST quality = Cost price of dearer = d = Rs. 13.70

Cost of 1 litre milk of 2nd quality = Cost price of cheaper = C = Rs. 11.90

Desired cost of 1 kg of the mixture = Mean price = m = Rs. 12.50

$(\begin{array}{l} {\rm{Required\;RATE}} = \frac{{{\rm{Quantity\;of\;Cheaper}}}}{{{\rm{Quantity\;of\;Dearer}}}} = \frac{{{\rm{d}} - {\rm{m}}}}{{{\rm{m}} - {\rm{c}}}}\\ \Rightarrow \frac{{{\rm{Quantity\;of\;Cheaper}}}}{{{\rm{Quantity\;of\;Dearer}}}} = \frac{{13.70 - 12.50}}{{12.50 - 11.90}} = \frac{{1.20}}{{0.60}} = \frac{2}{1} \end{array})$

∴ The ratio of the mixture should be 1 : 2



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