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ATQ, we can say that Sum of the presence of students on Monday, Tuesday and Wednesday = 3 × 32 = 96 Sum of the presence of students on Wednesday, Thursday, Friday and Saturday = 4 × 30 = 120 Sum of the presence of students of all six days is = 6 × 26 = 156 ∴ Presence of students on Wednesday = (96 + 120) – 156 = 60
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Two trains of same length are running in parallel tracks in the same direction with speed 60 km/hr and 90 km/hr respectively. The latter completely cros...
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