(a)

Question

Part A
At the beginning of the week, Mr. Burris opened a new box of 125 pencils. Sixty-five pencils were used during the week.

Which equation could be used to find x, the number of pencils left at the end of the week?

A
x+65=125


B
65−125=x


C
x−65=125


D
65x=125


(b)

Part B
Solve for x:

Answer 1

(a) To find the number of pencils left at the end of the week, we can use the following logic:

Mr. Burris started with 125 pencils, and after using 65 pencils, the equation to represent this situation would be:

\[ \text{Initial pencils} - \text{Used pencils} = \text{Pencils left} \]

This translates to:

\[ 125 - 65 = x \]

Rearranging this equation gives us:

\[ x + 65 = 125 \]

So the correct choice is:

A: \( x + 65 = 125 \)

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(b) Now, let's solve for \( x \):

To solve the equation \( x + 65 = 125 \):

1. Subtract 65 from both sides:

   \[ x = 125 - 65 \]

2. Calculate:

   \[ x = 60 \]

So, the number of pencils left at the end of the week is \( x = 60 \).