MBA Exam

if a number has 20 factors, then it can have maximum of how many different prime factors..approach pls

1) 8
2) 2
3) 3
4) 6
5) NOT

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MBA Other Question

Question:Eighty kilograms (kg) of store material is to be transported to a location 10 km away. Any number of couriers can be used to transport the material can be packed in any number of units of 10, 20 or 40 kg. Courier charges are Rs. 10 per hour.

1) 120
2) 210
3) 160
4) 190
a teacher asked a student to add nine 2-digit no. such that each no. is 10 more than the previous no. but the student has added all the no.,which are formed by interchanging the digits of each of the given no.surprisingly,the sum he got was the same as the sum the teacher has asked for.which of the following is the difference of the digits in the least of the no. the student was asked to add?pl, provide sol. also

1) 2
2) 3
3) 4
4) 5