∵ 9 Girls in 3 hours can prepare = 135 garlands
∴ 9 girls in 1 hour can prepare \(\)\(=\frac{125}{3}\)=45 garlands
∴ 1 girl in 1 hour can prepare \(=\frac{45}{9}\)=5 garland
∴ Number of girl needed to make 270 garlands in 1 hour \(=\frac{270}{5}\)=54girls
