Carlos Martin received a statement from his bank showing

a balance of $56.75 as of March 15. His checkbook shows a
balance of $87.37 as of March 20. The bank returned all the
cancelled checks but two. One check was for $5.00 and the
other was for $13.25. How much did Carlos deposit in his
account between March 15 and March 20?

87.37-56.75 = 30.62

5 + 13.25 = 18.25

30.62 - 18.25 = ?

To find out how much Carlos deposited in his account between March 15 and March 20, we need to calculate the change in balance.

Let's start by finding the change in balance from March 15 to March 20. We subtract the balance on March 15 from the balance on March 20.

Balance on March 20 - Balance on March 15 = $87.37 - $56.75

Next, we need to account for the two checks that were not returned by the bank. We subtract the amounts of these checks from the difference in balances calculated above.

Difference in balances - Amount of the first check - Amount of the second check = $87.37 - $56.75 - $5.00 - $13.25

Now, let's calculate:

$30.62 - $5.00 - $13.25 = $12.37

Carlos deposited $12.37 in his account between March 15 and March 20.