The number 2.85 can be writen using the fraction 285/100 which is equal to 57/20 when reduced to lowest terms. It is also equal to 2 17/20 when writen as a mixed number. You can use the following approximate value(s) for this number:57/20 =~ 2 6/7 (if you admit a error of 0.250627%)2.85 =~ 2 5/6 (if you admit a error of -0.584795%)2.85 =~ 3 (if you admit a error of 5.263158%)
Let x the age of John Amy's age = x + 9 from question, we get, John's age + Amy's age = 23 x+(x+9)= 23 => x + x + 9 = 23 => 2x = 23 - 9 => x = 14/2 => x = 7
