Question

if 3:7 : : b : 49 then b = ____​

Answer 1

Answer:

21

Step-by-step explanation:

Remark:- if a:b::c:d then a/b = c/d

Solution :- => 3:7 :: b:49

=> 3/7 = b/49

By cross multiplication

=> 7b = 49 × 3

=> b = 21

Answer 2

Answer:

Hence, the value of b is 21.

Step-by-step explanation:

In context to questions asked,

We have to find the value of b,

Given ratio:

$3:7 : : b : 49$

So, the given ratio is written as:

=> $\frac{3}{7}=\frac{b}{49}$

Now, by using the method of cross multiplication:

=> 7 $\times$ b = 3 $\times$ 49

Multiplying the terms, we get

=> 7b = 147

Now, divide both sides by $7$, we get

=> b = 21