Betty had $40 in her pocket. She bought 12 identical bags of popcorn. Betty was left with $10 after buying the popcorn. What was the price, in dollars, of each bag of popcorn?
0.55
2.50
4.17
5.20

Question

Betty had $40 in her pocket. She bought 12 identical bags of popcorn. Betty was left with $10 after buying the popcorn. What was the price, in dollars, of each bag of popcorn?
0.55
2.50
4.17
5.20

mrnood · Answer

if she started with $40, and was left with $10 then how much did she spend in total?

anonymous · Answer

huh?

mrnood · Answer

huh what?


if you had $40, and went shopping, when you come back you have $10 left - how much have you spent?

anonymous · Answer

30 dollars, right

mrnood · Answer

yes

so if you spent $30 on 12 things (for example packets of popcorn)

then you have to 'divide ' the 30 dollars ove r12 things

so how much did each cost?

anonymous · Answer

Oh wow so it'll be 2.50! 
Thanks!

anonymous · Answer

hey Mr. Nood, can you help me again?

Kelso is in charge of a bake sale. On each table, t, there will be a platter of 24 cookies and 2 bowls of brownies with b brownies inside. Kelso needs an additional 150 cookies to replace what he sells. This situation can be written as the following expression:

24t + (2b)t + 150

How many total sweets are there if there are 7 tables and 12 brownies in each bowl?

I don't want the answer, but help to figure it out.

anonymous · Answer

Well I mean I do want the answer, but I'd like to figure it out and learn it as well.

mrnood · Answer

well first 

you should start a new thread for a new question

but for now:

the question tells you that the number of tables is 7  (this is the value for t)
the question tells you the number of brownies in the bowl is 12  (this is the value for b)

so write the equation

$$number of sweets = (24\times t) + (2\times b \times t) +150$$

but wherever there is a t put 7
wherever there is a b put 12

then you can work out the answer

anonymous · Answer

The answer would be 486 if I did it correctly, right? 

And sorry, I'll make sure to make new questions instead of using this one from now on. Just didn't want to lose your help while I got it. Heh.

mrnood · Answer

That is the right answer - did oyu use the formula?

anonymous · Answer

Yessir, I just simply put in the numbers and replaced the symbols.

anonymous · Answer

Thank you for the help, MrNood. I'm going to close this question and put a new one, it's nice having to learn all this again.