there are a total of 87 students in the cafeteria. The number of boys in the cafeteria is 7 more than 3 the number of girls. How many boys are in the cafeteria

Question

There are a total of 87 students. The number of boys is 7 more than 3 the number of girls. How many boys are there.

Answer 1

The number of boys plus the number of girls = the total number of students

Let g represent the number of girls

Then the number of boys is 3g + 7 [in the problem you might be missing the word "times, The number of boys in the cafeteria is 7 more than 3 times the number of girls]

 

Since boys + girls = 87

   (3g + 7) + g = 87

 

Solve for g to get the number of girls in the cafeteria, then use g to calculate the number of boys.