Question

Each month, Charlie puts money in his piggy bank. He already had $20 from his allowance. He then added the same unknown amount he earns from walking his neighbor's dog. Charlie has saved a total of $240 in the last 4 months. How much did he earn from walking the neighbor's dog each month?

Charlie made $ __ each month from walking his neighbor's dog.

Answer 1

Let \( x \) be the amount Charlie earns each month from walking the neighbor's dog. Over the last 4 months, Charlie would have saved a total of \( 4x \) from dog walking, in addition to the $20 he started with.

The total amount he saved can be expressed as:

\[
\text{Total Savings} = 20 + 4x
\]

We know from the problem statement that this total is equal to $240:

\[
20 + 4x = 240
\]

To find \( x \), we first subtract 20 from both sides of the equation:

\[
4x = 240 - 20
\]

\[
4x = 220
\]

Next, we divide both sides by 4:

\[
x = \frac{220}{4}
\]

\[
x = 55
\]

Thus, Charlie earns $55 each month from walking his neighbor's dog.

So, the answer is:

Charlie made $ **55** each month from walking his neighbor's dog.