9 ∫ [√(10x/x+1)]dx ; x ∈ (0,9) is equal to (where [ ] represents greatest integer function)

Question

\(9 \int ^9 _ 0 \left[\sqrt {\frac {10x}{x+1}}\right]\)dx is equal to (where [ ] represents greatest integer function)

Answer 1

Correct answer is 155

= 5 + 6 × 25 

= 5 + 150 

= 155