Alright, so let's make both 7/8 and 3/10 into fractions with the same denominator. The lowest common denominator for both of these is 80. So, we multiply the top and bottom of 7/8 by 10, and the top and bottom of 3/10 by 8 to get fractions we can compare. So, we have 70/80 of a candy bar, and we want to make servings of 24/80 each. How many times can 24 go into 70? 2 times, with a remainder of 22. So, Tony can make 2 servings.
