Quantity A varies directly with the sum of the quantities B and C. If B increases by 3 and C increases by 6, by how much does A increase?
Explanation:
A ∝ (B + C)
Let A = K(B + C) where K is the proportionality constant
If B2 = B1 + 3 and C2 = C1+ 6,
A1 = K(B1 + C1) and A2 = K(B1 + 3 + C1 + 6)
A2 - A1= 9K
As K is unknown, A2- A1 cannot be found.
Hence, option (d).
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