Grades 3-4 Video Solutions 2022-2022_3-4

Video Transcription

Problem number 15. The students in a class sit in rows. There is the same number of students in each row.  There are two rows of students in front of Robert and one row of students behind him. In his row there are three students on his left and five students on his right.  How many students are there in his class? 10, 17, 18, 27, or 36.  If we find the total number of rows and the total number of students in each row, we can multiply them together and find the answer.  It says that there are two rows of students in front of Robert and one row behind him. So that means there are three, but not including his row, so three plus one is four.  So there are four rows. And then it says there are three students on his left and five on his right, which is eight. But then we have to add in Robert himself, which means nine.  And then nine times four, so nine students in each row times four rows is 36. So there are 36 students in total, which means our answer is E.

Video Summary

In the problem, students sit in an arrangement of rows with the same number of students per row. Given that there are two rows in front of Robert, one behind, and his own row, there are four rows in total. In Robert's row, there are three students on his left, five on his right, plus him, totaling nine students in a row. Multiply nine students by four rows to get the total number of students, which is 36. Therefore, the solution to the problem is that there are 36 students in the class, corresponding to option E.

Keywords

student arrangement

rows and columns

total students

classroom seating

math problem