How to solve this. Multiple op amps circuits in series
30 dB amplification as a voltage ratio is \$10^{30/20}\$ = 31.62.

Given that the 2nd stage has a gain of 10 the first stage has a gain of 3.16 hence, R1 approximately equals 3.162 kohm.


  30dB is amplification of 1000 times


30 dB is a power ratio of 1000 and a voltage ratio of \$\sqrt{1000}\$