If three out of every 5 people has brown eyes, how many learners in a class of forty five will have brown eyes?

Question

If three out of every 5 people has brown eyes, how many learners in a class of forty five will have brown eyes?

Answer 1

Dear Nicolas,

 

     Underline the 3 out of 5.  This means that you can make a fraction of 3/5= part/Total.  There are 45 (Total)in the class, so you can set up a proportion.

    

         3/5     =     part/Total                  You are missing the part.

 

3/5  =   X/45                            Then just cross multiply to solve for "X."

 

3(40) = 5X            

 

120 = 5X                           Solve for "X."                                                                     

 

120/5  = X

 

24 = X  Therefore, out of the 45 students, 24 have brown eyes.     Answer

 

     I hope that this problem will help you.

                                                                            Thank you,

                                                                            Susan C.

 

 

 

P.S.  Another way of doing it is changing 3/5 to a decimal and multiplying by 45.  3/5= .6     .6(45)=27