Position 81987

Find a number with six digits. If you put the last digit before the first, you get a new number that is five times larger.
The digits between must not change their position.

Correct answer:

X =  142857

Step-by-step explanation:

5 ABCDEF = FABCDE  Z=ABCDE  5 (Z 10 + F) = F 100000 + Z 50Z + 5F = 100000F + Z 49Z  = 99995F  7 Z = 14285 F  Z=14285 F=7  5 142857 = 714285  X=142857

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