A rough estimate would be 11/2.
Note: This is NOT an exact answer because the question asked for an ESTIMATE.
-14 divided by 13 as a fraction = -14/13
fraction of 13 divided by 6 = 13/6
1.4444
0.8667
4.3333
Divide the fraction 13/15 13 divided by 15 equals 0.87
2.6
13 divided by 20
0.6842
0.9286
4.3333
It is 3/13.