Question
A quantity x is directly proportional to another
quantity y. When x = 56, then y = 28. When y = 45, then find the value of x.Solution
x ∝ y, which means, when 'x' increases then 'y' will also increase and when 'x' decreases then 'y' will also decrease. So, Let, x = k X y (where, 'k' is a proportionality constant) ATQ,
56 = k X 28 So, k = (56/28) = 2 When 'y' = 45, then,
x = 2 X 45 = 90 Hence, option a.
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