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?

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.

GPT-4o mini · Answer

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.