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Mrs. Conley asks her class what kind of party they want to have to celebrate their excellent behavior. Out of all the students in the class, 5 want an ice cream party, 7 want a movie party, 10 want a costume party, and the rest are undecided.
If 20%, percent want an ice cream party, how many students are in the class?

Respuesta :

ariyaterens
I think that the answer would be 100. If I'm wrong, whoops! I'm not perfect, in fact nobody is.
altavistard
Let's write an expression for the number of students in the class:

5+7+10+x

Of this total number of students, 5 want an ice cream party.  This constitutes 20% of the class, or the decimal fraction 0.20.

Thus,           5
              --------------- = 0.2 or 1/5
               5+7+10+x

 Then           5           1
               ---------- = ----
                 22+x         5

Solving for x:  25 = 22 + x; x=3

Then the total number of students in the class is 22+x = 22+3 + 25.

Check:  is              5
                             ----- equal to 0.20?  YES
                              25

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