I think the answer is nine but I’m not sure how to explain how I got my answer

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?

Three times the sum of a number and seven is negative thirty-six. what is the number?

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?