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 324 grams of compound X?
Choose one:
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 324 gms of X have 324*10/12= 
<gadget id="calculator">324*10/12</gadget>
<output>270</output>
270 gms of B   and  324-270= 
<gadget id="calculator"> 324-270</gadget>
<output>54</output>
54 gms of A.   cross check:- A/B= 54/270 =2/10 (as given)   Ans 270
<result>D</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 324 grams of compound X?