Priya and Elena are members of the Science Club. Last week, they observed two families of birds nesting in the woods. The members were divided into two equal groups; each group studied one family. Every day after school for 5 days, each group hiked to visit their bird family. Priya’s group hiked 2.5 fewer kilometers each day than Elena’s group. If Priya’s group hiked a total of 19 kilometers last week, how far did Elena’s group hike each day?

Define a variable to represent the unknown

Use your variable to write an equation that represents the scenario.