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Question 667723: What is the answer for 30 less than 4 times a number is equal to 40?
Answer by gwendolyn(128)   (Show Source):
You can put this solution on YOUR website! Less than indicates subtraction, so we are subtracting thirty from 4 times a number. Let's call this number x. 4 times x is (4x).
Now, we know that 4x - 30 is equal to 40. We can replace "is equal to" with an equals sign, and we have our equation:
4x - 30 = 40
All we have to do now is solve for x.
Let's add 30 to both sides:
4x = 40 + 30
4x = 70
Then, let's divide both sides by 4
4x/4 = 70/4
x = 17.5
Now that x is by itself on one of the sides of the equation, we can see that the number is equal to 17.5.
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