contestada

Consider the following exam question and student solution. Determine whether the solution is correct. If it is not​ correct, write a note to the student explaining why it is wrong and give a correct solution.

Exam​ question: You can buy a 32
​-pound
bag of flour for ​$9

or you can buy a​ 1-pound bag for  ​$0.45
.
Compare the per pound cost for the large and small bags.

Student​ solution: The large bag price is 32
divided by ​$9equals​$3.56
per​ pound, which is much more than the 45 cents

per pound price of the small bag.

Respuesta :

frika

Answer:

See explanation

Step-by-step explanation:

Large bag:

You can buy a 32​-pound bag of flour for ​$9, then 1 pound costs

[tex]\$9\div 32=\$0.28125\approx \$0.28[/tex]

Small bag:

You can buy a​ 1-pound bag for $0.45.

Compare:

[tex]0.28<0.45,[/tex]

the large bag price is less than the small bag price.

Mistake:

Student apllied incorrect division: instead of dividing the price by the number of pounds, he divided the number of pounds by the price (this gives him the amount of pounds per one dollar)

Otras preguntas