Fractions

[MeltingButter]

I Got My Fraction Math Test Back and We Have To Do Corrections. For One Question I Don't Understand What I Did Wrong. Can Someone Explain How To Correct The Answer. Thanks

Math Question: Twenty-five Grade 8 students are going on a school trip. They pre-order sandwiches. Three-quarters of the students order a turkey sandwich, while 1/4 of the students order a roasted vegetable sandwich. Of the 3/4 who want turkey, 2/5 do not want mayonnaise. What fraction of the students do not want mayonnaise?

My Answer: 25/1 x 3/4 x 2/5
= 75/4 x 2/5
= 150/20
= 30/4
= 7 2/4
= 7 1/2 → 8

8 of the fraction of students do not want mayonnaise.

 

[lookagain]

I Got My Fraction Math Test Back and We Have To Do Corrections.
For One Question I Don't Understand What I Did Wrong. Can Someone Explain How To Correct The Answer. Thanks

Math Question: Twenty-five Grade 8 students are going on a school trip. They pre-order sandwiches.
Three-quarters of the students order a turkey sandwich, while 1/4 of the students order a roasted vegetable sandwich.
Of the 3/4 who want turkey, 2/5 do not want mayonnaise. What fraction of the students do not want mayonnaise?

My Answer: 25/1 x 3/4 x 2/5
= 75/4 x 2/5
= 150/20
= 30/4
= 7 2/4
= 7 1/2 → 8

8 of the fraction of students do not want mayonnaise.

MeltingButter, there is no correct answer to this problem. The instructor gave the class
an impossible question. For this problem to work, the number of students needs to be a
multiple of 20. The instructor is doing a disservice to the class.

MeltingButter, can you private message me and give me a way to contact your instructor,
or have your instructor make a public post in this thread regarding this problem? You should
never be given this type of problem in your class.

 

[MeltingButter]

I searched the internet, and somehow the answer is 3/10? I don't understand... I got a different answer, Calculator got a different answer and the internet has a different answer! Very Confusing... How do you private message?

 

[Quaid]

Twenty-five Grade 8 students are going on a school trip. Three-quarters of the students order a turkey sandwich, while 1/4 of the students order a roasted vegetable sandwich.

The second sentence above is nonsensical because it's equivalent to saying that 18.75 students ordered turkey and 6.25 students ordered vegan; contrary to the occasional experience, there's no such thing as "fractional people".


EDIT: I also had not seen lookagain's or Denis' post, when I replied; that's kinda weird.

 

[trinzed]

Agree with previous replies. No such thing as 18 3/4 people. But if we wanted to get 2/5 of 1, we would multiply 1/1 * 2/5 . Can get 2/5 of 3/4 the same way.

 

[mmm4444bot]

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