HELP ME PLEASE WILL GIVE BRAINLIST

I'll give brainliest if you answer right : )

When keisha installed a fence along the 200 foot perimeter of her rectangular back yard, she left an opening for a gate. in the diagram below, she used x to represent the length in feet of the gate? what is the value? a. 10 b. 20 c. 25 d. 30

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?