Question

Find a in the following proportions:- 3,a,5,20

Answer 1

Product of mean = product of ecreme
a*5= 3*20
a= 60/5
a=12

Answer 2

Answer:

12

Step-by-step explanation:

Product of Mean×Product of Extreme

3:5::5:20

3×20× 5

3×20/5

now cut 20 /5

3 × 4

Ans- 12