Answer :

sihamabdi
77 + 14 = 91
91 - 11 = 80

Therefore, 80 + 11 = 90
The answer is 80. Hope I helped!
77 + 14 = x + 11
        91 = x + 11
        80 = x

Therefore the blank is 80.

80 + 11 = 91
77 + 14 = 91

91 = 91

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