If you have 500 apples and your freind asks for two apples but he says he will pay $3.00 for it then it changes to $9.00 how much apples do you have left reamber its not two apples he is asking for

Amountain climber starts a climb at an elevation of 453 feet above sea level at his first rest stop he has climbed 162 feet and by his second rest stop he has climbed another 207 feet its getting late in the day so the climber starts his way down if the climber desends 285 feet how much does he need to ascend or descend to return to the original starting point