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Ahn has 64 crayons. This number is 18 more crayons than Bill has. Which equation should be used to find b, the number of crayons Bill has?

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Kalvoizviz
formula will be a+b=c
given: a=64
         b=?
         c=18
a+b=c
a-c=b
then, substitute the given
64-18=b
46=b
let b be the crayons of Bill
my formula is  a -b - c = 0
 a  =64
 b = ?
 c = 18

solution:  64 - 18 = b
                   46 = b 
 
             Bill's crayons are 46 pcs.