Question

Alice takes her favorite number, adds 5 to it, multiplies the answer by 10, subtracts 20 from the result, and then drops the final 0. if alice's (correct) answer is 9, what is her favorite number?

Answer 1

(x + 5 ) 10 - 20 = 10x +50 -20 = 10 x +30 = 10 ( x+3 )

we drop the zero

x + 3 = 9

x= 9- 3= 6