(Three of anything) plus (another three of it) = (six of the same thing)
three fifths plus one quarter = 17 twentieths
47 fifths or 9 and 2 fifths
Three and four-fifths
They add to: 4 and 1/5
Eight and three fourths plus six and two fifths is fifteen and one twentieth.
The answer is negative five and two-fifths or -5.4.