Given: In an election four parties A, B, C and D contested for a post. 40% of the votes polled are for parties A and B combined, 30% of the votes polled are for parties B and C combined.
Asked: Which party won the election (which party had the maximum number of votes polled for it)?
Let the votes for parties A, B, C & D be Va, Vb, Vc & Vd respectively
Va + Vb + Vc + Vd =100%
Va + Vb = 40%
Vc + Vd = 100% - 40% = 60%
Va + Vb = 40%
Vb + Vc = 30%
Va - Vc = 10%
Party A got more votes than party C.
Vc + Vd = 60%
Vb + Vc = 30%
Vd - Vb = 30%
Party D got more votes than party B.
(1) C and D together have a share of 60% of the total votes polled.
The information is already derived above and is not sufficient
NOT SUFFICIENT
(2) A and C together have a share of 40% of total votes polled.
Va + Vc = 40%
Va - Vc = 10%
Va = 25%
Vc = 15%
Vd = 45%
Vb = 15%
Party D is the winner with 45% votes
SUFFICIENT
IMO B