arithmetic math

if b=15 and c=6700 and b= 17 and c=7500 what is c if b=0

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  1. let c=mb+a

    then 6700=m*15+a
    and 7500=m*17+a

    subtract the first from the second
    800=2m or m=400

    and 6700=400*15+a so a=6700-6000=700

    so, if b is zero

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