Philip, Dylan, and Corey have sold a total of 290 school buttons. Corey sold 64 more school buttons than Philip. Dylan sold 62 fewer school buttons than Philip. How many school buttons did Dylan sell?
Notice that all data is in reference to Philip, so
let number of buttons for Philip be x
number for Corey ---- x+64
Dylan ---- x - 62
x + x+64 + x-62 = 290
now just solve for x , then sub into my definitions.