I've been practicing probability for a while and now I encountered a math problem which I don't know how to approach.
One integer is selected randomly from the set $[1,50]$ . What is the probability that the selected will satisfy the following inequality: $29 \leqslant 7n+3 \leqslant 99$
I don't know how to begin. Could someone help me with this and reference a link or a web page where I can learn more about math problems like this ?