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put this solution on YOUR website!let the two angle are = A and B
so Angle A + Angle B = 90 degree
or A+ B = 90
again as per question let A = B + 3
putting the value of A in the above equation we have
or B + 3 + B = 90
or 2B + 3 = 90
or 2B = 90- 3= 87
B = 87/2 = 43.5 degree
so A = 90 - 43.5 = 46.5 degree (Ans)