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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