Explanation:

- Let's begin with the ratio of the ages of Charvi and Vaishnavi, which is given as 4:5.

- This means if Charvi is 4x years old, Vaishnavi is 5x years old.

- It's also stated that Yuvika is 2 years older than Charvi, making her age 4x + 2.

- Yuvika is also 5 years younger than Vaishnavi. So, we express it as 5x - 5.

- Setting the equations for Yuvika equal: 4x + 2 = 5x - 5.

- Solving for x, you get x = 7.

- Substituting back to find Vaishnavi's age: 5x = 35 years.

- Vaishnavi is 35 years old.

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