How to Calculate Amplitude Using Decibels?

[ninjamidget]

I have got an assignment in which i need to compare wave interference, so i am going to use decibels readings which i had gotten from experiments and the reference amplitude which is 60 to calculate this very very confusing task.



i have gotten these formulas derived from which i derived from the original formula
A= AR/20log10 x dB
A= -20log10/AR x Db



i am WAY off and so confused with this, would really require help

 

[ninjamidget]

Any help would be greatly appreciated

 

[ehild]

I do not understand what the task is. Do you know the dB reading with respect to a reference -is that "60" amplitude or intensity? -and want to find the amplitude of the resultant wave?