In what ratio should cement costing Rs. 250 per bag be mixed with cement costing Rs. 325 per bag so that the cost of the mixture is Rs. 300 per bag. (A bag of cement is 50 kg).
1 : 2
By alligation, the ratio of cheaper to costlier cement is the cross-difference of their costs with the mean:
\[\text{Cheaper : Costlier} = (325-300):(300-250) = 25:50 = 1:2\]
Therefore the required ratio is 1 : 2.
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