Question

4:20::8:? Option A=73,B=72,C=75,D=78

Answer 1

Option A is right
4×5=20
similarly,8×9=72
Hope this helps you...^_^

Answer 2

Answer:

Step-by-step explanation:

Concept:

We will use the concept of ratio and proportion .

Given:

The expression is given that $4:20::8:?$

To Find:

We need to find the fourth value of the above ratio.

Solution:

According to the formula of proportion , $a:b::c:d=(a \times b)=(b \times c)$.

Here $a=4$ , $b=20$ and $c=8$ . The value of $d$ has to be calculated.

Therefore,$d=\frac{b\times c}{a}$ .

The value of $d=\frac{20\times 8}{4}=40$ .

The fourth value is $40$ .

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