Exam Maths Puzzle Category

1/x+1/y=1/z..where x=12

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Exam Other Question

XYZ + ZXY = ZYX

where X,Y and Z are 0-9 digits. i.e.,
if number = 123 = XYZ ==> X=1,Y=2,Z=3. A and B can finish a work in 12 days B and C can finish the same work in 20 days .If A,B and C working together for 4 days and after that C left the work .Now how many days A and B will take to finish the work.