Same as finding the LCM of 6, 5, 7: 2*3*5*7 = 210
7/20
1 7/20
minus three fifths
Assuming that you mean "fifths", the answer is three fifths.
7 and 1/5
6 and two fifths
7
7 4/5
3/5+4/5=7/5=One and two fifths
7/5 x 3/5 is 21/25
8/5 x 7/2 = 56/10 = 5.6 or five and three fifths
7/10
Same as finding the LCM of 6, 5, 7: 2*3*5*7 = 210
7/20
1 7/20
7 x 3/5 is 4 1/5