Answer:

1. a = 3

2. b = 5

3. H = 2

4. y = 1

5. x = 5

Step-by-step explanation:

do ratio and proportion

1. 9 : 3 = a: 1

(9×1)/3 = a

9/3 = a

3 = a

2. 3 : b = 6 : 10

(3×10)/6 = b

30/6 = b

5 = b

3. H : 7 = 8 : 28

(7×8)/28 = H

56/28 = H

2 = H

4. 7 : y = 35 : 5

(7×5)/35 = y

35/35 = y

1 = y

5. 10/20 = x/10

(10×10)/20 = x

100/20 = x

5 = x

for detailed explanation, must visit youtubechannel SolvingMath with Leonalyn or search "Leonalyn ratio and proportion"