Question 1133195
Walmart has a bike on sale for $150. The sign next to it says that the price is $25 off the original price. What is the original price? Define the variable and equation for the situation. Solve the equation.

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This question is from my son's Math test. His answer is as follows:

Let x = original price
x = 150 + 25; x = 175.

His teacher marked it wrong and wrote the equation as x - 25 = 150.

I don't see how the equation my son wrote is wrong? Could you please help me understand?
<pre>I guess he didn't write the correct equation based on the way the problem was formulated.
Let original price be x
Price after $25 discount: x - 25
Also, it was given that the price after discount or sale price = 150
We then EQUATE them to get: x - 25 = 150
That's somewhat PETTY though. I agree with the other tutor that partial credit should have been awarded, because if this problem were on an exam,
whether open-ended or multiple choice, he would've gotten FULL MARKS. 
I guess though that this must be a lesson on following EXACT INSTRUCTIONS and the way he wrote it was not EXACTLY how itw's stated. 
A good lesson, I guess for someone young showing he/she how important it is to follow INSTRUCTIONS precisely.