In plants, exchange of gases takes place through
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Solve the value of D?
A + B = 15 .... (1)
B x C = 84 .... (2)
C ÷ 4 = 3 .... (3)
B + D = 18 .... (4)
From (3), we get C = 12
From (2), we get B = 84/12 = 7
From (1), we get A = 15 - 7 = 8
From (4), we get D = 18 - 7 = 11
Hence, D = 11.
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