Sarah has 50 problems to doon her homework. she completes 25 of her math problems. she has 25 left. when she gets home from school she plans to complete 50% more of her work before dinner. how many will she have left after doing another 50%?

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