Some examples of writing two ratios and setting them equal to each other to solve proportion word problems
Writing proportions is a free educational video by Khan Academy.It helps students in grades 7 practice the following standards 7.RP.A.3.
1. 7.RP.A.3 : Use proportional relationships to solve multistep ratio and percent problems. Examples: simple interest, tax, markups and markdowns, gratuities and commissions, fees, percent increase and decrease, percent error..