IBPS Government Jobs Exams Logical Reasoning Number Series

In the following number series only one number is wrong. Find out the wrong number.
850, 600, 550, 500, 475, 462.5, 456.25
A)600 B)550 C)500 D)462.5 E)475

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IBPS Other Question

A train travels a distance of 600 km at a constant speed. If the speed of the train is increased by 5 km/hr, the journey would take 4 hrs less. Find the speed of the train.
A)100 km/hr B)25 km/hr C)50 km/hr D)75 km/hr E)80 km/hr Two pipes A and B together can fill a cistern in 4⅘ hours. Had they been opened separately, then B would have taken 4 hours more than A to fill the cistern. How many time will be taken by A to fill the cistern separately?
A)6 hours B)5 hours C)8 hours D)7½ hours E)None of these