If we want to figure out the ages of Octavia and her brother we will need to check our information. their ages add up to 39 and her brother is 7 years older than her first you will think of all numbers that equal 39; 1+38, 2+37, 3+36, 4+35, 5+34, 6+33, 7+32, 8+31, 9+30, 10+29, 11+28, 12+27, 13+26, 14+25, 15+24, 16+23, 17+22, 18+21,and 19+20 then eliminate all the numbers that don't have a difference of 7 which will leave the following; the only numbers left are 16 and 23
so that means that her brother is 23 and Octavia is 16
To get simplest form you make it the smallest fraction you can make it by dividing both sides by the same number until it's not possible anymore Hope that helped!