Question

A problem states: "There are 9 more children than parents in a room. There are 25 people in the room in all. How many children are there in the room?"

Let c represent the number of children.

Which expression represents the number of parents?

Answer 1

The expression for the number of parents is

p = 25 -c

Explanation:

I did the quiz and this was the answer :)

Answer 2

Let c = number of children in the room.
Let p = the number of parents in the room.

There are 9 more children than parents in the room. Therefore
c = p +9 (1)

There are 25 people in the room. Therefore
c + p = 25 (2)

Answer:
The expression for the number of parents is
p = 25 -c

-------------------
Note:
We can determine the number of children and parents.
Substitute (1) into (2).
p + 9 + p = 25
2p + 9 = 25
2p = 25 - 9 = 16
p = 16/2 = 8
c = p + 9 = 8 + 9 = 17

Number of children = 17
Number of parents = 8