Question
If ‘r’ increases directly as ‘s’, and when r = 120,
s = 30, then what will be the value of ‘r’ when ‘s’ = 45?Solution
ATQ,
r ∝ s
So, Let, r = k × s (where, ‘k’ is a proportionality constant)
ATQ,
120 = k × 30
So, k = (120 / 30) = 4
So, when ‘s’ = 45, then,
r = 4 × 45 = 180
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