Hey! So the the answer to your question is 77.
This is because to find out how many grapefruits they sold, you would first need to find the two numbers to you can multiple 10 and 1 by so they would add up to 307 and 100. The numbers that work are 23 and 77. So, when you multiply 10 to 23 (10 because it’s the cost of nuts), you would get the answer of 230. Then you would subtract 307 by 230 because 307 is the total amount of money they earned from selling. When you do that, you would get 77. After that, you multiply 1 times 77 because the cost of the grapefruit is $1. When you add 23 and 77, you should get 100. The total items they sold. When you add 230 and 77, youd get 307. So, there were 77 grapefruits that they sold.
Hopefully this is right