self Maths Puzzle

Find the unit's digit in 264102+264103

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self Other Question

3 men go into a Hotel.
The man behind the desk said the room is $30, so each man paid $10 and went to the room.
A while later the man behind the desk realized the room was only $25, so he sent the bellboy to the 3 guy's room with $5.
On the way the bellboy couldn't figure out how to split $5 evenly between 3 men, so he gave each man a $1 and kept the other $2 for himself.
This meant that the 3 men each paid $9 for the room, which is a total of $27, add the $2 that the bellboy kept = $29.
Where is the other $? In a meet, persons from five different places have assembled in Bangalore High School. From the five places the persons come to represent are 42,60,210,90 and 84. What is the minimum number of rooms that would be required to accommodate so that each room has the same number of occupants and occupants are all from the same places?