A alone can complete a work in 16 days and B alone can do in 12 days. Starting with A, they work on alternate days. The total work will be completed in  Pick:  A) 13 1/4  B) 13 1/2  C) 13 3/4  D) 13 4/4  E) 13 2/3
Explanation:   A's 1 day work = 1/16   B's 1 day work = 1/12   As they are working on alternate day's   So their 2 days work = (1/16)+(1/12)   = 7/48   [here is a small technique, Total work done will be 1, right, then multiply numerator till denominator, as  7*6= 
<gadget id="calculator"> 7*6</gadget>
<output>42</output>
42, 7*7= 49, as 7*7 is more than 48, so we will consider 7*6, means 6 pairs ]   Work done in 6 pairs = 6*(7/48) = 7/8   Remaining work = 1-7/8 = 1/8   On 13th day it will A turn,   then remaining work = (1/8)-(1/16) = 1/16   On 14th day it is B turn,   1/12 work done by B in 1 day   1/16 work will be done in (12*1/16) = 3/4 day   So total days =   13 3/4   Option 13 3/4
<result>C</result>
A alone can complete a work in 16 days and B alone can do in 12 days. Starting with A, they work on alternate days. The total work will be completed in