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Question
Construct a word problem on quadratic equation, such that one of its answers is 20 (years, rupees, centimeter, etc.). Also, solve it.
Solution
Find the roots of a equation x² - 10x = 200
x² - 10x = 200
=> x² - 10x - 200 = 0
=> x² - 20x + 10x - 200 = 0
=> x(x - 20) + 10(x - 20) = 0
=> (x + 10)(x-20) = 0
=> x = 20 or x = -10
hence one of its answer is 20
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