Answers

2014-06-19T15:31:46+08:00
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

0
2014-06-19T15:57:14+08:00
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.
1 5 1