Answer:
Explanation:
Let's call the number of hot dogs Mr. Macho ate on the first day "h". On the second day, he ate h + 7 hot dogs, on the third day he ate h + 7 + 7 = h + 14 hot dogs, and so on. After five days, the total number of hot dogs he ate would be h + (h + 7) + (h + 14) + ... + (h + 28) = 125 hot dogs.
Expanding the expression for the total number of hot dogs, we get:
5h + 28 + 21 + 14 + 7 = 125
Solving for h:
5h = 75
h = 15
Therefore, Mr. Macho ate 15 hot dogs on the first day.