Question

question 1 of 23 (1 point) | question attempt: 1 of 1
none of the above
(b) x - 9 = 27
a classroom had x students. then 9 of them went home. there are now 27 students in the classroom.
in a classroom, there are x boys. there are 9 times as many girls as boys. there are 27 girls.
a classroom has 27 students. there are x boys and 9 girls.
there were 9 girls in a classroom. then x of them left. there are now 27 girls in the classroom.
none of the above

Explanation:

Step1: Analyze the equation meaning

The equation $x - 9=27$ means we start with a quantity $x$, subtract 9 from it, and get 27.

Step2: Check each option

• Option 1: A classroom had $x$ students. Then 9 of them went home. There are now 27 students in the classroom. Mathematically, this is represented as $x - 9 = 27$, which matches the given equation.
• Option 2: If there are $x$ boys and 9 times as many girls as boys with 27 girls, the equation is $9x=27$, not $x - 9 = 27$.
• Option 3: If a classroom has 27 students with $x$ boys and 9 girls, the equation is $x + 9=27$, not $x - 9 = 27$.
• Option 4: If there were 9 girls and $x$ of them left and now there are 27 girls, the equation is $9 - x=27$ (which is incorrect as the number of girls can't increase if some left), not $x - 9 = 27$.

Answer:

A classroom had $x$ students. Then 9 of them went home. There are now 27 students in the classroom.