A+B+C=450
A+B=400
B+C=430
B=?
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Answer:
A+B+C / 3 = 450
A+B+C= 1350...........(i)
A+B / 2 = 400
A+B= 800............(ii)
B+C / 2 = 430
B+C= 860.............(iii)
Equation (ii) + (iii)
A+B+C+D = 1660
1350 + B = 1660
B = 310
ANSWER: 310
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