MBA Exam

The sum of 2 natural numbers when added to their LCM gives a total of 143 .How many such paired numbers exist

1) 12
2) 9
3) 8
4) 6

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MBA Other Question

How many 5-letter words can be formed using As, Bs, Cs and Ds only, which do not contain the word BAD?

1) 960
2) 976
3) 1024
4) 924
In a stream, B lies in between A and C such that B is equidistant from both A and C. A boat can go from A to B and back to C in 6 and 1/2 hours while it goes from A to C in 9 hours. How long would it take to go from C to A?please post approach @gyrodceite @pari1901 @CobainJr.

1) 3.75h
2) 4h
3) 4.25h
4) 4.5h