If 9 girls can prepare 135 garlands in 3 hours, how many girls are needed to prepare 270 garlands in 1 hour?
∵ 9 Girls in 3 hours can prepare = 135 garlands
∴ 9 girls in 1 hour can prepare =
∴ 1 girl in 1 hour can prepare = garland
∴ Number of girl needed to make 270 garlands in 1 hour = girls