SOLUTION: the sum of a first number and a second number is 280. The second number is equal to 400 decreased by three times the first number.

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Question 237335: the sum of a first number and a second number is 280. The second number is equal to 400 decreased by three times the first number.
Answer by unlockmath(1688) About Me  (Show Source):
You can put this solution on YOUR website!

Hello,
First, let's look at what you know. Both numbers equal 280. Let x be the first number and second number will be 400-3x. Now we can write out the equation:
x + 400 - 3x = 280 Combine like terms and subtract 400 from both sides.
-2x = -120 Now get x alone:
x = 60
RJ Toftness
www.math-unlock.com