In a LAB experiment, a 100 ml compound of element X and element Y needs to be increased to 120 ml by adding some quantity of element X, and some quantity of element Y. If the original compound contains 30% of element X, how much (in ml) of element Y must be added so that element X will be exactly one third of the resulting mixture ?	Choose the most appropriate option:
A) 40 ml B) 100/3 ml C) 20 ml D) 20/3 ml E) 10 ml
There are 0.3*100= 
<gadget id="calculator">0.3*100</gadget>
<output>30</output>
30 ml of element X in the initial solution.   We need X to be 1/3rd of 120 ml in the resulting solution, so 40 ml. Thus out of 20 ml of solution added, 10 must be X (in order it to become 40 ml) ans the remaining 10 must be Y.   Answer: 10 ml
<result>E</result>
In a LAB experiment, a 100 ml compound of element X and element Y needs to be increased to 120 ml by adding some quantity of element X, and some quantity of element Y. If the original compound contains 30% of element X, how much (in ml) of element Y must be added so that element X will be exactly one third of the resulting mixture ?