Judy has $100 and Elenore has $75. Judy is saving $5 per day and Elenore is saving $7 per day.

What equation would be used to find out how many days it will take for Judy and Elenore to have the same amount of money saved?

1 answer

To determine how many days it will take for Judy and Elenore to have the same amount of money saved, you can set up the following equations:

Let \( d \) represent the number of days.

For Judy:

  • Starting amount: $100
  • Amount saved per day: $5
  • Total amount after \( d \) days: \( 100 + 5d \)

For Elenore:

  • Starting amount: $75
  • Amount saved per day: $7
  • Total amount after \( d \) days: \( 75 + 7d \)

Now, to find the number of days when their total amounts will be equal, you set the two equations equal to each other:

\[ 100 + 5d = 75 + 7d \]

This equation can be solved for \( d \) to find out how many days it will take for Judy and Elenore to have the same amount of money saved.