A spirit and water solution is sold in a market. The cost per liter of the solution is directly proportional to the part (fraction) of spirit (by volume) the solution has. A solution of 1 liter of spirit and 1 liter of water costs 40 cents. How many cents does a solution of 1 liter of spirit and 2 liters of water cost?
Choose the correct choice from the following answers
A) 40	B) 33	C) 50	D) 51	E) 52
Yes, ensure that you understand the relation thoroughly!   Cost per liter = K * Fraction of Spirit   40 cents is the cost of 2 liters of solution (1 part water, 1 part spirit). So cost per liter is 20 cents. Fraction of spirit is 1/2.   20 = K * (1/2)   K = 40   Cost per liter = 40 * (1/3) (1 part spirit, 2 parts water)   Cost for 3 liters = 40 * (1/3) * 3= 
<gadget id="calculator">40 * (1/3) * 3</gadget>
<output>40</output>
40 cents   A. 40 cents
<result>A</result>
A spirit and water solution is sold in a market. The cost per liter of the solution is directly proportional to the part (fraction) of spirit (by volume) the solution has. A solution of 1 liter of spirit and 1 liter of water costs 40 cents. How many cents does a solution of 1 liter of spirit and 2 liters of water cost?