Question

3A+25=B2
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Answer 1

given.
  3a+25=b2

  3 A
  2 5
+______
  B 2  

 a = 7 and b = 6
  as when 37 is added to 25 it gives 62
∴a = 7 and b = 6      

Answer 2

Hey!

Easy!

  3 A
+2 5
=====
 B  2
=====

here, A + 5 ≠ 2
Possibility, A + 5 = 12
                 A = 12 - 5
                A = 7
Now, Carry 1, 
♦ 1 + 3 + 2 = B
♦ 6 = B

hence Verified values of A and B!