Question

1. All of the following proportions are equivalent except



a/b=c/d

b/a=d/c

a/d=c/b

a/c=b/d

2. The extremes in the proportion 3/4=15/20 are



3 and 4

3 and 20

15 and 4

15 and 20

3. 1:2 = 4:8

The product of both the means and the extremes is



2

4

8

16

4. A 30-inch segment is cut into two parts whose lengths have the ratio 3 to 5. Find the length of the shortest part.



2

3.75

6

11.25

@sammixboo can you help me?