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A painter has painted one -third of a rectangular wall which is ten feel high. When he will paint another 75 square feet of that wall, he will have finished three-quaters of the job. What is the length (the horizontal dimension) of the wall?

A painter has painted one -third of a rectangular wall which is ten feel high. When he will paint another 75 square feet of that wall, he will have finished three-quaters of the job. What is the length (the horizontal dimension) of the wall? Correct Answer 18 feet

ধরি, wall - এর area = x বর্গফুট ∴13×x + 75 = 34×x ⇒x3 - 3x3 = - 75 ⇒3x4 - x3 = 75 ⇒9x - 4x12 = 75 ⇒5x = 12×75 ⇒ x = 180 ∴ Wall - এর দৈর্ঘ্য 18010 = 18 feet

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