Question
What is the value of ‘x’ if x% of 720 added to {2160
÷ x of 20} × 2 gives 180?Solution
ATQ,
x% of 720 + {2160 ÷ x of 20} × 2 = 180
Or, 7.2x + 432/x = 180
Or, Multiply both sides by 10:
72x + 4320/x = 1800
Or, x² – 25x + 60 = 0
Or, x² – 20x – 5x + 100 = 0
Or, x(x – 20) – 5(x – 20) = 0
Or, (x – 5)(x – 20) = 0
Or, x = 5 or x = 20
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