At the pet store, 3 cans of Nutri-Cat food cost $6

During the sale, the pet store had a special price for a different brand of cat food. One can of that brand cost $1.70, or a package of 3 cans cost $4.90. What would the lowest cost be for 13 cans of cat food? How many cans can be purchased for $37.70? Explain how you solved both problems.

Question

At the pet store, 3 cans of Nutri-Cat food cost $6

During the sale, the pet store had a special price for a different brand of cat food. One can of that brand cost $1.70, or a package of 3 cans cost $4.90. What would the lowest cost be for 13 cans of cat food? How many cans can be purchased for $37.70? Explain how you solved both problems.

anonymous · Answer

@Hoslos

anonymous · Answer

are you sure this is correct because i have to give this to my teacher

anonymous · Answer

@Hoslos  @Michele_Laino

anonymous · Answer

so your not sure about the problem?

anonymous · Answer

@Michele_Laino  and @Hoslos  Plz help me!

anonymous · Answer

For the first part, it is given that 3 cans cost $1.70. Then according to ratio and proportion, 13 cost $x.
Then $$x=\frac{ 13*1.70 }{ 3 }=7.37$$.

anonymous · Answer

Second part)
Use again ratio and proportion:
If 3 cans cost $1.7, then x cans cost $37.7.
$$x=\frac{ 37.7*3 }{ 1.7 }=66.5$$, rounded to 65 cans.

anonymous · Answer

Thank you @Hoslos

anonymous · Answer

i have one more question that i am going to post in a minute