Alice takes her favorite number, adds 5 to it, multiplies the answer by 10, subtracts 20 from the result, and then drops the fin
al 0. if alice's (correct) answer is 9, what is her favorite number?
1 answer:
(x + 5 ) 10 - 20 = 10x +50 -20 = 10 x +30 = 10 ( x+3 )
we drop the zero
x + 3 = 9
x= 9- 3= 6
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