Compound X contains elements A and B at an approximate ratio, by weight, of 2:10. Approximately how many grams of element B are there in 300 grams of compound X?  Select the correct option: A) 54 B) 162 C) 250 D) 270 E) 322
total number of fractions =2+10= 
<gadget id="calculator">2+10</gadget>
<output>12</output>
12   element B constitutes=10 out of 12 parts of X   So in 300 gms of X have 300*10/12= 
<gadget id="calculator">300*10/12</gadget>
<output>250</output>
250 gms of B   and  300-250= 
<gadget id="calculator"> 300-250</gadget>
<output>50</output>
50 gms of A.   cross check:- A/B= 50/250 =2/10 (as given)   Ans 250
<result>C</result>
Compound X contains elements A and B at an approximate ratio, by weight, of 2:10. Approximately how many grams of element B are there in 300 grams of compound X?