The answer is 1/3.
You divide the top and the bottom by 7.
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77 over 21 = 11/377 ÷ 7 = 1121 ÷ 7 = 3
Yes, because 3 is the only number that both can be divided by to further reduce both sides. 21/3 = 7, 30/3= 10 so, 21/30 = 7/10
52/7 = 156/21 - 50/21 =106/21 or 5 and 1/21
7/21:= 7 ÷ 21= 0.333 in decimal
1 over 3 7/21 = 1/3