Posted by Tina on .
The difference of three times a number and 5 is 40. Find the number.

Algebra 
Ms. Sue,
3x  5 = 40
3x = 45
x = ?? 
Algebra 
Tina,
is the answer 42...thank you Ms.Sue

Algebra 
Ms. Sue,
No. How can three times 42  5 = 40?
3x  5 = 40
Add 5 to both sides of the equation.
3x = 45
Divide both sides of the equation by 3.
x = ?? 
Algebra 
marisa,
the answer would be 15 becuase when you divide 45 by 3 you would get 15