book Maths Puzzle Numerical Ability

2b=20+b

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book Other Question

Work Problems PLEASE HELP ME?? EVEN IF YOU ONLY KNOW HOW TO START THIS. CAN SOMEONE GIVE ME ANY INFORMATION???
Jenny has bought a new condo. The closing has been set for 45 days
Please Help Me Again!!Thanks For The Other Help,too!
5x=4y-7
4x=5y-2
thank you!!!!!!!!!!