Algebra $2|$Exam $6$

$25.$ An equation for loudness $L$ in decibels is given by $L=10logR,$ where $R$ is the sound's relative intensity. An air$-$raid siren can reach $150$ decibels and jet engine noise can reach $120$ decibels. How many times greater is the relative intensity of the air$-$raid siren than that of the jet engine noise?