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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