Selena and Josh were running in a race. Together they ran 36 miles. Josh ran half of the distance that Selena ran. How many miles did Selena run?
Let J = Josh's distance
2J = Selena's distance
J + 2J = 36
3J = <<36=36>>36 miles
J = <<12=12>>12
2J = <<24=24>>24 miles
Selena ran 24 miles.
#### 24