Question

Find the missing number in the following proportions. 20 : 40 :: d : 30​

Answer 1

Explanation:

Given

proportions. 20 : 40 :: d : 30

20/40=d/30

d=20×30/40

d=30/2

d=15.

Answer 2

9514 1404 393

Answer:

15

Explanation:

The proportion can be written as fractions:

`(20)/(40)=(d)/(30)\\\\(600)/(40)=d\qquad\text{multiply by 30}\\\\\boxed{d=15}\qquad\text{finish the computation}`