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651.A class has four sections and the number of students in each section is 50, 40, 30 and 20. The pass percentage of these sections is 20%, 15%, 30%, and 50% respectively. The failure percentage of the entire class is?
652.Two discounts of 15% and 30% are equal to a single discount of?
653.If x + 1/x = 5, what is the value of x² + 1/x²?
654.A student was solving a question of Mathematics. While he was doing calculations, he multiplied a number by 3/2 instead of 2/3. The percentage error in the calculation is?
655.A mark is initially placed in the upper-right corner of a transparent square. The square is rotated 90° anticlockwise, reflected across its vertical centre-line, and then rotated 180°. Where is the mark finally located?
656.A person faces north, turns 90° right, then 135° left, and finally 45° right. Which direction is the person facing?
657.Beginning with 5, a sequence is formed by repeatedly applying these operations in order: add 4, multiply by 2, and subtract 3. What is the seventh displayed number when the starting number is counted as the first?
658.Two angles of a triangle measure 15° and 85°. What is the measure for the third angle?
659.Every record cleared by Unit X carries a digital signature. A particular record has no digital signature. Which conclusion is valid?
660.Sarah is twice as old as her youngest brother. If the difference between their ages is 15 years, how old is her youngest brother?