Bank Exam Government Jobs Exams Numerical Ability Averages

average weight of 12 students in a class is 30kg. two boys leave the class and two boys whose avg weight is 25kg join the class. if the new average of the class is 30 5/6kg, what is the avg weight of the boys who left the class?

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Bank Exam Other Question

when the speed of monorail is 60 km/hr it reaches on time.If speed is increased by 20 kms it reaches one hour earlier then how much distance does the monorail cover? after allowing a discount of 10 percent , a shopkeeper gains 20 percent with respect to sp. to get 20 percent gain with respect to cp, the percentage of discount needed to be offered is?

options:
a: 13.6 % b:10% c:Can't say d: 15%