Posted by Tina on Monday, October 6, 2008 at 2:06pm.
The difference of three times a number and 5 is 40. Find the number.

Algebra  Ms. Sue, Monday, October 6, 2008 at 2:19pm
3x  5 = 40
3x = 45
x = ??

Algebra  Tina, Monday, October 6, 2008 at 2:33pm
is the answer 42...thank you Ms.Sue

Algebra  Ms. Sue, Monday, October 6, 2008 at 2:40pm
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, Monday, October 6, 2008 at 4:08pm
the answer would be 15 becuase when you divide 45 by 3 you would get 15
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