Mr. Lee regularly spends a total $145 commuting to
work by train Monday through Friday. On Wednesday
of a given five-day week, however, Mr. Lee decides to
commute to work by car, instead of by train. If the cost
of commuting by car is $7, how much money does Mr.
Lee save commuting to work that week? (Assume the
regular train fare is the same each day of the week.)

F.
$    7
G.
$  12
H.
$  22
J.
$138
K.
$143

Let's break down the problem step by step:

1. Mr. Lee regularly spends a total of $145 commuting by train Monday through Friday. This means his daily train fare can be found by dividing the total cost by 5:
   \[
   \frac{145}{5} = 29
   \]
   So, Mr. Lee spends **$29 per day** on train fare.

2. On Wednesday, Mr. Lee decides to commute by car, which costs $7.

3. To find out how much Mr. Lee spent that week, we calculate:
   - For Monday, Tuesday, Thursday, and Friday, Mr. Lee commuted by train, so he spent:
     \[
     29 \times 4 = 116
     \]
   - On Wednesday, he spent $7 commuting by car.

   Therefore, the total amount Mr. Lee spent commuting that week is:
   \[
   116 + 7 = 123
   \]

4. Normally, Mr. Lee would spend $145 commuting for the entire week by train. Thus, the amount he saved by commuting by car on Wednesday is:
   \[
   145 - 123 = 22
   \]

The correct answer is **H. $22**.

Would you like more details or have any questions?

Here are 5 related questions to expand your understanding:
1. What if the car fare was $10 instead of $7, how much would Mr. Lee save then?
2. How would Mr. Lee's savings change if he commuted by car two days that week?
3. What would happen if Mr. Lee's regular train fare was reduced to $25 per day?
4. How much would Mr. Lee save if the total commuting expense for the week was $120, but he used the car one day?
5. If Mr. Lee used a combination of both car and train every week, how would you calculate the total cost?

**Tip:** To compare costs over multiple days, always find the daily rate first to simplify calculations.

Mr. Lee regularly spends a total $145 commuting to work by train Monday through Friday. On Wednesday of a given five-day week, however, Mr. Lee decides to commute to work by car, instead of by train. If the cost of commuting by car is $7, how much money does Mr. Lee save commuting to work that week? (Assume the regular train fare is the same each day of the week.)

Learn how to calculate Mr. Lee's savings when he switches from commuting by train to commuting by car on one day. This problem focuses on basic arithmetic operations, including cost calculation and subtraction, suitable for students in Grades 5-7.

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