1. 8
If A+B=C is the given number equation then the logical resoning hidden in this puzzle is as below
C=A-B^2
So the Answer is 72-8^2=72-64=8
2. 7
If ABC=D is the given number equation then the logical resoning hidden in this puzzle is as below
D=BC-AB
So the Answer is 41-34=7
3. 783
If ABC=D is the given number equation then the logical resoning hidden in this puzzle is as below
D=ABC+AB
So the Answer is 712+71=783
4. 54
If ABCD=E is the given number equation
Let's say D>A>B>C then the logical resoning hidden in this puzzle is as below
E = DA-BC
So the Answer is 75-21=54
5. 5
If ABC=D is the given number equation then the logical resoning hidden in this puzzle is as below
D = AC/B
So the answer is 25/5 = 5.
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