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Let number of students in first school = x ⇒(60 x)/100 + 30 = x ⇒x – (60 x)/100 = 30 ⇒ (40 x)/100 = 30⇒ x = 75 ∴ Number of passed students = 75 -30 = 45 Number of students in second school = 75 + 25 = 100 Number of passed students = 45 + 20 = 65 ∴ Pass percentage of the latter school = 65%
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A certain sum is invested at a simple interest rate of 10% per annum for a certain period. If the sum becomes five times the principal at the end of the...
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