I think it is the third one.
Answer: The products are carbon monoxide, water and carbon.
Explanation:
Using coupons seems like an old-fashioned, time-consuming way to save a few cents on the products you buy at the grocery store. After all, most coupons don't usually have a face value of more than $1 and, quite often, they're worth far less. But done properly, couponing can save you thousands of dollars every year.
40 watts because 120-80 is forty or 80 + 40 - 120
