MBA Exam

There are three 3 digit numbers x, y, and z. The digits of the three numbers are non-zero digits formed of (1, 2, 3….9) using each of them exactly once. The ratio of x : y : z is 1 : 3 : 5. Find the sum of the digits of the number ‘x’?

1) 10
2) 12
3) 9
4) 13

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MBA Other Question
two trains of length 110 metres and 90 metres are running on parallel lines in the same direction with a speed of 35 km per hour and 40 km per hour respectively. in what time will they pass each other?i am writing this question for the second time because in first time i have posted all options wrong so this time i am writing correct options. option A is correct.

1) 2 min 24 sec
2) 3 min 3 sec
3) 4 min 3 sec
4) 1 min 5 seconds
 if 4 whole no's are taken at random & multiplied together, what is the probability that the last digit in the product is 1,3,7 or 9plz explain

1) 15/653
2) 12/542
3) 16/625
4) 13/625