In a LAB experiment, a 100 ml compound of element X and element Y needs to be increased to 300 ml by adding some quantity of element X, and some quantity of element Y. If the original compound contains 40% 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 correct choice from the following answers: A) 40 ml B) 100/3 ml C) 140 ml D) 20/3 ml E) 10 ml
There are 0.4*100= 
<gadget id="calculator">0.4*100</gadget>
<output>40</output>
40 ml of element X in the initial solution.   We need X to be 1/3rd of 300 ml in the resulting solution, so 100 ml. Thus out of 200 ml of solution added, 60 must be X (in order it to become 100 ml) ans the remaining 140 must be Y.   Answer: 140 ml
<result>C</result>
In a LAB experiment, a 100 ml compound of element X and element Y needs to be increased to 300 ml by adding some quantity of element X, and some quantity of element Y. If the original compound contains 40% 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 ?