I always need help you guys are smart

Show me how you find x and determine what x is you i appreciate it : )

What is the perimeter of a rectangle if the length is 5 and the width is x?

Asix-sided die of unknown bias is rolled 20 times, and the number 3 comes up 6 times. in the next three rounds (the die is rolled 20 times in each round), the number 3 comes up 6 times, 5 times, and 7 times. the experimental probability of rolling a 3 is 10 %, which is approximately % more than its theoretical probability. (round off your answers to the nearest integer.)