79
49 + 25 = 74
74 - 4 = 70
70 + 9 = 79
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25+15=40+9=49
49/25= 4.36
The missing number is 49. This is why: 1 plus 2 equals 3, then 3 squared is 9. 2 plus 3 equals 5, then 5 squared is 25. Therefore, the missing number must be 49 to make the number sentence (3 plus 4 equals 7, then 7 squared is 49) true.
It is: 11/12 plus 4/9 = 49/36
When you simplify 49 plus 37 (49+37), the result is 86.