Correct Answer - Option 3 : 5 liters

**Given:**

Total amount of juice = 35 liters

The ratio of A and B = 4 ∶ 3

**Calculation:**

Let the amount of A and B in juice be 4x and 3x

Then, according to the question, we have

4x + 3x = 35 liters

⇒ 7x = 35 liters

⇒ x = 5 liters

So, the amount of A = 4x = 4 × 5 = 20 liters

And, amount of B = 3x = 3 × 5 = 15 kg

Difference of A and B = (20 - 15) liters = 5 liters

So, if we add 5 liters of B then we get the ratio 1 ∶ 1

**∴ The required amount of mango is 5 liters.**