Water consists of hydrogen and oxygen, and the approximate ratio, by mass, of hydrogen to oxygen is 2:16. Approximately how many grams of hydrogen are there in 171 grams of water?  Pick:
A) 11	B) 13	C) 15	D) 17	E) 19
(2/18)*171= 
<gadget id="calculator">(2/18)*171</gadget>
<output>19</output>
19 grams   The answer is 19.
<result>E</result>
Water consists of hydrogen and oxygen, and the approximate ratio, by mass, of hydrogen to oxygen is 2:16. Approximately how many grams of hydrogen are there in 171 grams of water?