self Maths Puzzle

Some more additions

THE
TEN
MEN
----
MEET

SLOW
SLOW
OLD
----
OWLS

SAL
SEE
THE
SUEZ
-----
CANAL

FIVE
FIVE
NINE
ELEVEN
------
THIRTY

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self Other Question

P represents prime digits

PPP
xPP
-----
PPPP
PPPP
-----
PPPPP
12 black mice and 1 white mouse are in a ring. Where should a cat start so that if he eats every 13th mouse the white mouse will be last?