A dishonest milkman wants to make a profit on the selling of milk. He would like to mix water (costing nothing) with milk costing Rs.35 per litre so as to make a profit of 20% on cost when he sells the resulting milk and water mixture for Rs.40 In what ratio should he mix the water and milk?	Pick:
A) 1:20
B) 1:10
C) 1:8
D) 1:4
E) 6:11
water = w (liter)   Milk = m (liter)   ==&gt; Cost = Price x Quantity = 0.35m   ==&gt; Revenue = Price x Quantity = 0.40(m + w)   ==&gt; Profit =0.40(m+w) - 0.35m = 0.2*(0.35m)[20% of cost]   ==&gt; 0.40m + 0.40w - 0.35m = 0.07m   ==&gt; 0.02m = 0.40w   ==&gt; m/w = 0.40/0.02= 
<gadget id="calculator">0.40/0.02</gadget>
<output>20</output>
20   --OR--   w/m= 1/20   1:20 is correct.
<result>A</result>
A dishonest milkman wants to make a profit on the selling of milk. He would like to mix water (costing nothing) with milk costing Rs.35 per litre so as to make a profit of 20% on cost when he sells the resulting milk and water mixture for Rs.40 In what ratio should he mix the water and milk?