book Maths Puzzle Numerical Ability

given: AC=DF and AB=DE ____________________
Prove: BC = EF A B C

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book Other Question

When the vaule b is less than 8 a is negative. please explain this answer.
a=1/2b-4 show work, thanks need help solve for r:1/8(r+3)=6.
If you can help to solve it also as subtraction.
Thank you, it will a big help