Answer:
3 10/21
Explanation:
He bought 6 large watermelons->
give 1 2/3 to cousin and 6/7 to sam.
Rest gave to mother..
6-1 2/3= 4 1/3-6/7= 3 10/21
3 10/21 is the correct Answer because..
3 10/21+1 2/3+6/7=6
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