Alcohol cost 3.50 per litre and kerosene oil cost 2.50 per litre. In what proportion these should be mixed so that the resulting mixture may be 2.75 per litre? Choose the correct option.
A) 2 : 5	B) 1 : 3	C) 4 : 7	D) 2 : 3	E) None of these
∴ Required ratio = 0.25⁄0.75 = 1⁄3 i.e, 1 : 3   Answer 1 : 3
<result>B</result>
Alcohol cost 3.50 per litre and kerosene oil cost 2.50 per litre. In what proportion these should be mixed so that the resulting mixture may be 2.75 per litre?