Forty-five children attend a preschool. the number of two-year-olds is one
half the number of three-year-olds. the number of four-year-olds is the
same as the number of 3-year-olds.
a. how many two-year-olds attend the preschool?
b. how many three-year-olds attend the preschool?
c. how many four-year-olds attend the preschool?

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