Exam Maths Puzzle Logical Reasoning

XYZ + ZXY = ZYX

where X,Y and Z are 0-9 digits. i.e.,
if number = 123 = XYZ ==> X=1,Y=2,Z=3.

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Exam Other Question

If birth rate and death rate of a city is 10% each find population of the city after 2 years.current population of the city is 3000.
A. 3000
B. 2940
C. 3060
D.3630
1/x+1/y=1/z..where x=12