The quotient of x and 7 is equal to 13. define variable and then write an expression to model the situation

If 20% of a number is 35, what is 50% of that number?

One side of a rectangle is 7 feet shorter than seven times the other side. find the length of the shorter side if we also know that the perimeter of the rectangle is 306 feet.

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?