If A : B 3, then 144A : 36B is 

Correct option is B

Let's go through the solution step by step.

Given:

• A : B = 3
• We need to determine the ratio 144A : 36B

Step 1: Express the given ratio as a fraction
Since A : B = 3, we can write:

A / B = 3

Multiplying both sides by 144 and 36 respectively:

(144A) / (36B) = (144 × A) / (36 × B)

Step 2: Substitute A / B = 3

(144 × 3B) / 36B = (432B) / 36B

Cancel B from numerator and denominator:

432 / 36 = 12

Final Answer: (B) 12