On Saturday, you spend $33, give $15 to a friend, and receive $20 for mowing your neighbor’s lawn. You have $21 left. Use two methods to find how much money you started with that day.

You started with $ that day.

M = 33+15+21-20

M = 49
Day started with $49

The answer is $49 your welcome!!!!!!!!!!

21= left

33+15=48
48-20=28
28+21=$49

Well, let's crunch some numbers and find your starting amount using two methods:

Method 1: Subtraction
If we subtract all the money you spent and gave away from the money you have left, we can find your starting amount.
Starting amount - Money spent - Money given away + Money received = Money left

Let's fill in the numbers:
Starting amount - $33 - $15 + $20 = $21

Now, let's solve this equation:
Starting amount - $28 = $21

To isolate the starting amount, we add $28 to both sides:
Starting amount = $21 + $28
Starting amount = $49

So, using the subtraction method, you started with $49 that day.

Method 2: Addition
We can also use addition to find your starting amount. Starting with the money you have left and adding the money spent, money given away, and money received should give us the same result.
Money left + Money spent + Money given away - Money received = Starting amount

Plugging in the numbers:
$21 + $33 + $15 - $20 = Starting amount

Solving this equation:
$49 = Starting amount

So, using the addition method, you also started with $49 that day.

Therefore, both methods lead us to the conclusion that you started with $49 that day.

To determine how much money you started with on Saturday, we can use two different methods.

Method 1: Subtracting and Adding

1. Start with the amount of money you have left at the end of the day, which is $21.
2. Subtract the amount you received for mowing your neighbor's lawn, which is $20.
$21 - $20 = $1
3. Now, subtract the amount you gave to your friend, which is $15.
$1 - $15 = -$14
4. Finally, add the money you spent earlier in the day, which is $33.
-$14 + $33 = $19

Therefore, using the subtracting and adding method, you started with $19 that day.

Method 2: Reversing the Transactions

1. Add the money you received for mowing your neighbor's lawn, which is $20.
2. $21 + $20 = $41
3. Add the money you gave to your friend, which is $15.
4. $41 + $15 = $56
5. Lastly, subtract the money you spent earlier in the day, which is $33.
6. $56 - $33 = $23

Therefore, using the reversing the transactions method, you started with $23 that day.

So, the two methods yield different answers. According to the first method, you started with $19, while the second method suggests you started with $23.

Here is one method. Let x = starting $.

x - 33 - 15 + 20 = 21

Solve for x.