Quantities a and b are inversely proportional to each other. When a = 4, b = 480. Find b when a = 3.
Explanation:
a ∝ 1/b
a1b1 = a2b2
If a1 = 4, b1 = 480 and a2 = 3,
b2 = a1b2a2 = 4×4803 = 640.
Hence, 640.
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