The sum of six fifths and two fifths is (8/5), and the difference is (4/5). The sum of the maximum true score and the minimum false score in the unit of 1 7 is (1 6 /7). The decimal units of 3 and 2/5 are (1/5), and he has such decimal units as (17). If you fill in (3) such decimal units, it will be the smallest composite number.