Answer: 1.) 28, 2.) 6, 3.) 16, 4.) 150, 5.) I'm not sure because I think there's a piece of information missing...

Step-by-step explanation:

1.)

7 people:2 houses, x people:8 houses

Since 8 houses divided by 2 houses = 4, we multiply 4 (which is the proportion between the 2 ratios) by 7 to get 28. The final ration would then be 28 people:8 houses (you can check that this is correct by simplifying it to see if it matches the original ratio for example 28 divided by 4 = 7 and 8 divided by 4 is 2, so this should be correct)

2.)

5 people: 1 car, 30 people: x cars

So this is similar to number 1. You find the proportion between the two ratios by dividing 30 people by 5 people to get 6. Then, multiply 6 by 1 to find the number of cards for 30 people which is 6.

3.)

3 boys: 4 girls, 12 boys: x girls

Once again, same method. 12 divided by 3 is 4, and 4 x the 4 girls is 16. So we have 16 girls.

4.) 15 books: 1 reading book, x books: 10 reading books.

10 divided by 1 is 10, multiplied by 15 to get 150.

5.)

I can't form a ratio here because the problem doesn't give how many people the two doctors can treat in one day.