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andrey2020 [161]
2 years ago
13

If a ∝ b and a = 18 when b = 3, then find a when b = 5.

Mathematics
1 answer:
Elden [556K]2 years ago
4 0

"a ∝ b" means "a is proportional to b", which in turn means there is some constant k such that

a = kb

We're given that a = 18 and b = 3, so that

18 = 3k   ⇒   k = 6

Then when b = 5, we would have

a = 6 × 5 = 30

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