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 30 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:
A) 13  B) 30  C) 50  D) 51  E) 52
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">30 * (1/3)</gadget>
<output>10</output>

<gadget id="calculator">10 * 3</gadget>
<output>30</output>

<result>B</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 30 cents. how many cents does a solution of 1 liter of spirit and 2 liters of water cost?
multiply(multiply(30, divide(1, add(1, 2))), add(1, 2))
"yes , ensure that you understand the relation thoroughly ! cost per liter = k * fraction of spirit 30 cents is the cost of 2 liters of solution ( 1 part water , 1 part spirit ) . so cost per liter is 15 cents . fraction of spirit is 1 / 2 . 15 = k * ( 1 / 2 ) k = 30 cost per liter = 30 * ( 1 / 3 ) ( 1 part spirit , 2 parts water ) cost for 3 liters = 30 * ( 1 / 3 ) * 3 = 50 cents b . 30 cents"