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Mystery product

ABCDE is a five-digit integer. Each digit is different.

A six-digit integer X is formed by putting a 1 at the right-hand end of ABCDE.

Another six-digit integer Y is formed by putting a 1 at the left-hand end of ABCDE.

X is three times Y.

1ABCDE x 3 = ABCDE1

What is the five-digit integer ABCDE?

SOLUTIONS Fish tank (age 6 to 10) Mystery product (age 10 to 14) ABCDE is 42 857.

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