The younger brother is 15. Let x be the age of the brother, 2x be the age of the sister, 15 their age gap. Then, write the equation based on the facts given: 2x - x = 15 x = 15 (age of the brother) Check the solution by replacing the value of x: 2(15) - 15 = 15 30 - 15 = 15 15 = 15

- Wash your eyes continuously for at least 15 minutes with fresh water; - take the bottle of sanitizer and; - immediately go to your doctor or to the ER , do not hesitate since there might be harmful chemicals in the sanitizer.