15 students preordered the year book and 9 students paid full price.
<u>Solution: </u>
Given that
Cost of pre-ordered year book = each
Cost of full price of year book = each
Number of students in Mr. Hillman's class purchased yearbooks = 24
Total price spent by 24 students to purchase year book =
Need to determine number of students pre-ordered and number of students paid full price.
Let assume number of student pre-ordered year book = x
As out of 24, x students pre-ordered the yearbook , so remaining are the ones who paid full price
So number of students paid full price =
Money spent by students who pre-ordered the book = number of student pre-ordered year book multiplied by Cost of 1 pre-ordered year book =
Money spent by students who paid full price = number of students paid full price x Cost of 1 full price year book =
Total price spent by 24 students to purchase year book = Money spent by students who pre-ordered the book + Money spent by students who paid full price
On solving above expression for x, we get
Number of student pre-ordered year book =
Number of students paid full price =
Hence 15 students pre-ordered the year book and 9 students paid full price.