A and B undertake to do a piece of work for $120. A alone can do it in 4days while B alone can do it in 6days. With the help of C, they finish it in 2days. Find the share of B?  Options:
A) $150	B) $100	C) $200	D) $50	E) $40
C's 1day work = (1/2)-(1/4 + 1/6) = 1/12   A:B:C= 1/4 : 1/6: 1/12 = 3:2:1   B's share = 120*2/6= 
<gadget id="calculator">120*2/6</gadget>
<output>40</output>
$40   Answer is $40
<result>E</result>
A and B undertake to do a piece of work for $120. A alone can do it in 4days while B alone can do it in 6days. With the help of C, they finish it in 2days. Find the share of B?