Question

Your English class has 27 students. You would like to treat the class to cookies. You would like each person to have 3 cookies. Which expression would help you figure out how many cookies you would need to bake?

Answer 1

let number of students =x
number of cookies =y
eact student will get 3 cookies..
so y =3x.
i suppose this should be the answer

Answer 2

I agree with the above answer, although I think it makes more sense when observing units. We have a number of students (x), a number of cookies (y), and a rate (3): cookies/student.
\( \displaystyle \frac{\text{cookies}}{\cancel{\text{student}}} \times \cancel{\text{students}} = \text{cookies}\)

\(\displaystyle \frac{3 \text{ cookies}}{1 \text{ student}} \times x \text{ students} = y \text{ cookies}\)

\(3x = y\)

I am just offering a potentially useful way of looking at these problems. I found this more intuitive recently in other Algebra problems. :)

Answer 3

lol so was i wrong or something.. or not the right way to explain?

Answer 4

Nah, you are correct. I just wanted to offer a second way to get the answer that I like / I think is really interesting. :)

Answer 5

ohh lol i use it mostly in physics and thermodynamics.. lol its more like my trick :P