A composite tube is made by striking a thin steel tube on a brass tube. If `A_(S)` and `A_(B)` are the respective sectional areas of the steel and brass tubes and `Y_(S)` and `Y_(B)` their Young's moduli, then find the Young's modulus of single tube of the same length and total sectional area, which would behave in the same fashion as that of the composite tube.

Explanation

To find the Young's modulus of a single tube that behaves the same way as a composite tube made of steel and brass, we can follow these steps:

### Step-by-Step Solution:

1. **Define the Variables**:
- Let \( A_S \) = sectional area of the steel tube
- Let \( A_B \) = sectional area of the brass tube
- Let \( Y_S \) = Young's modulus of the steel tube
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