MBA Exam

find da maximum value of n such that 570*60*30*90*100*500*700*343*720*81 is perfectly divisible by 30^n?

1) 12
2) 14
3) 11
4) 13

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MBA Other Question
A student gets marks in the ratio 2:3:4:5 the maximum marks in these subjects is 6:7:8:9.he scores 48% overall. What is maximum individual marks amongst the subjects??sorry guys dont have options.pls help

The average of the two digit numbers which remain the same when the digits interchange their position is :

1) 33
2) 44
3) 55
4) 66