Question

12. Algebra There are 92 students in the third and fourth grades at Johnsonville Elementary. Of these, 47 are in fourth grade. Write an equation to find how many third graders there are. Use a question mark to represent the unknown number and solve.

Answer 1

x + 47 = 92. <--- x represents the number of 3rd graders

x +47-47 = 92-47

x=45

There are 45 third grader. Hope this helped!

Answer 2

`?+47=92`

The number of students in third grade 45

Explanation:

Given : There are 92 students in the third and fourth grades at Johnsonville Elementary.

Of these, 47 are in fourth grade.

To Find : Write an equation to find how many third graders there are. Use a question mark to represent the unknown number and solve.

Solution:

Number of students in fourth grade = 47

Let ? be the number of students in third grade

So, total number of students =
`?+47`

We are given that There are 92 students in the third and fourth grades

So,
`?+47=92`

`?=92-47`

`?=45`

Hence an equation to find how many third graders there are is
`?+47=92` and the number of students in third grade is 45.