Question

Andrew is trying to create a number puzzle for his younger sister to solve. He challenges his sister to find the mustery number. when 4 is subtracted from half a number the result is 5. The equation to represent the mystery number is 1/2m -4 =. Andrews sister tries to guess the mustery number. Her first gues is 30. Is she correct? why or why not? What is the correct answer?

Answer 1

She is not correct b/c if you solve the problem the mystery number is 18.

1/2m-4=5
+4 +4
1/2m=9 divide 9 by 1/3

m=18

You can check by replacing the m with 18 in the original equation and it will equal to 5.