Step-by-step reasoning process: Nina made 2 cake layers which were equal to 2 x 12 = 24 cupcakes. She made the equivalent of 24 + 12 = 36 cupcakes in all. Thus, there are 720 / 36 = 20 grams of sugar in a cupcake.
The question and answer:
Question and answer: Nina made a two-layer cake and a dozen cupcakes for her friend’s birthday party. Each layer of cake takes the same amount of sugar to make as a dozen cupcakes. Nina used 720 grams of sugar to bake everything. How many grams of sugar are in one cupcake?
The answer is 20

Step-by-step reasoning process: The number of humans on the island is 100 / 2 = 50. There are 1 / 2 * 50 = 25 sheep on the island. The total number of sheep and humans is 25 + 50 = 75.
The question and answer:
Question and answer: There are twice as many centipedes as humans on a certain island and half as many sheep as humans. How many sheep and humans in total are on the island if the number of centipedes is 100?
The answer is 75

Step-by-step reasoning process: There are 40 / 2 = 20 women at the event. Hence, there are a total of 40 + 20 = 60 men and women at the event. So, the total number of children at the event is 80 - 60 = 20. After Oleg added 10 children to the guest list, there are a total of 20 + 10 = 30 children.
The question and answer:
Question and answer:
Oleg is an event organizer. He is organizing an event with 80 guests where 40 of them are men, half the number of men are women, and the rest are children. If he added 10 children to the guest list, how many children will there be at the event?
The answer is 30