book Maths Puzzle Numerical Ability

5xsquare-3xy-2ysquare=0,0.5x+2y=6

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book Other Question

Theo made an elaborate code to remember the 10-digit combination to his bicycle lock. This is the code he came up with:

A-K-B-J-C-H-D-G-E-F

Each let
(2m-7)^2-8(2m-7)+12=0