7th Grade Ratio And Proportions Worksheets - BYJU'S 7th Grade Ratio and Proportion worksheets feature problems such as: Q1: If x: y = 2:3, then what should be 2x + 3y: 4x + 5y? Answer: If x: y = 2:3, then x/y = 2/3, or 3x = 2y, or x = 2y/3. Applying this formula to the bigger ratio, 2x + 3y = (2 x 2y/3) + 3y = 13y/3 And 4x + 5y = (4 x 2y/3) + 5y = 23y/3