ANSWER :
In order from least to greatest, it is 1/4, 3/5, 6/7
Explanation:
If you make them all decimals, 1/4 is .25, 6/7 is around .8, and 3/5 is .6. In order form least to greatest, that is .25, .6, .8. That would mean in fraction form it is 1/4, 3/5, 6/7.