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## 4th grade foundations (Eureka Math/EngageNY)

### Unit 1: Lesson 3

Topic D, E, & F: Foundations# 2-step word problem: truffles

CCSS.Math:

Sal solves a two-step word problem by drawing a picture and creating an equation. Created by Sal Khan.

## Want to join the conversation?

- what if qestons are above your level(12 votes)
- ...maybe tell someone and search for something easier on Khan academy? (Oh wait, this was 5 yrs ago but whatever.)(9 votes)

- Guys I am about to have the PARCC/IAR test what videos will help?(4 votes)
- I wonder if 4x6=gx3 - if 3 is the half of 6, can I use the logic of 8x3 because I used half on one side and doubled on the other? The answer happened to be correct, but will my logic get me in trouble later on?(3 votes)
- Your logic is good! It is always true that in a multiplication problem, if we double one number and halve the other one, the answer (product) will be the same.(3 votes)

- Mfg

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Skdnfblkd#mvosdkjgbsfibmdfokvm lkdf bbldmf vol dfvlm.dfkgm/. Dlvknbvknb. Ldvjnb. Ldjvnb. Djvnv pkdfn v kpdfn v pkdfn gbkdfnknfg bjkngnjkgn defensivenesses cfgfeg premenopausal c Jake sad. I’m going back to the house to go to the gym with the girls for the night so fdI’ll you guys are welcome to come in sand or do you want me to bring it up with the girls or if they are still in there too I’ll be home by the end of the week or Sunday night and I can bring them to you tomorrow o the one on Saturday or Friday I have to be in the room for a little while I have to go to the store and i and get some stuff and I’ll bring it back to the(3 votes)- What do you mean? It sounds like you are going crazy kinda.|:(3 votes)

- what is the answer Because I don't get it:

my book has 79 pg. I have been reading 10pg each day there is 9 pg left how many days have I've been reading?

someone explane it plzzzz(3 votes)- alright yes, i can help you, first lets count how many tens does it take to get to 70? and you might say why not say 79 well that is taken care of becasue renember there are nine pages so lets count to 70 in tens, 10 20 30 40 50 60 70.so hhow many times did i count if its to hard just count the numbers i said and the answer is 7! i hope that answerd your question bye :)(3 votes)

- Essentially, We know 4 boxes of Chocolates were brought to the party.

Each box contains 6 truffles.

So we plug in the terms (4x6) = g + 3

Because we know that 3 truffles were eaten each and G represents the number of guests.

4(6) = 24 = g + 3

24 = g + 3

Since we need to evaluate for G we need to divide 24 by 3.

x8

3(24)

-24

0

G = 8

I may have not written it correctly but I assume this is basic algebra as well?(2 votes)- Hold on here, 4x6 = g+3, right?

so we need to solve:

4 x 6 = 24

24 is the same as g + 3, so 24-3 is equal to g.

(in other words 24 - g should equal 3.)

Therefore g = 21.

because 21 (or g) + 3 = 24

A variable is a letter assigned a value so it can be used in math, this value must be discoverable, or the variable is undefined, and cannot have any math done on it.

(Also, capitalizing a variable ("g") turns it into a different variable: "G", which you said equals eight.)(4 votes)

- The problems are very easy(3 votes)
- I wish there was a little harder way to get the answer but i did 4 times 6 and then divided by 3=8 people at the party(3 votes)
- How do you keep the profile picture how you want it to be?(2 votes)
- If you mean your profile avatar, just choose your avatar and press save.(3 votes)

## Video transcript

Akshay brought four boxes of
chocolate truffles to a party. Each box contains 6 truffles. Every guest at the party
ate exactly 3 truffles, and there were none left over. How many guests
must there have been at the party, must have
attended the party? So we're trying to figure
out how many guests must have attended the party. So let's actually define a
letter to represent that. So let's say that p, or
let's say g, g for guests, let's say that g is equal to the
number of guests at the party. Then we could actually
set up a relation between the number of guests,
the number of truffles each guest ate, and then the
total number of chocolates. So what was the total
number of chocolates that we have at this party? Well, he bought 4 boxes. And each box
contains 6 truffles. So the total number of
chocolates at the party must have been 4 times 6. 4 times 6 truffles
must have been the total number of
truffles at the party. So let me write this down. This is the number
of truffles total. Now, what's another
way of thinking about the total number
of truffles at the party? Well, you have g guests. So you have g guests. And each guest ate 3 truffles. So g times 3 is also going
to be the number of truffles at the party-- number
of truffles total. So these two things need
to be equal to each other. So we could figure
out what 4 times 6 is. And then we say, well, 4 times
6 is going to be some number. And g times 3 has to
equal that same number. What must g be? So let's think about
that step by step. So let's just
visualize 4 times 6. So here is one box of truffles. We get 6 truffles. So it's 1 times 6, 2 times
6, 3 times 6, and 4 times 6. Or another way of
thinking about 4 times 6, that's the same thing
as 6 plus 6 plus 6 plus 6, which is 6, 12, 18, 24. So what we have here on
the left hand side is 24. So we get 24. And now we know
that this is going to be equal to the number
of guests at the party. This is going to be equal to the
number of guests at the party times 3. So what times 3 is equal to 24? And another way of viewing this
is if g times 3 is equal to 24, that means that 24 divided
by 3 must be equal to g. So one way of thinking
about it, if I were to divide these
truffles, these 24 truffles, into groups of 3,
3 for each guest, well, the number of
groups I'm going to have will tell me the number
of guests I have. So let's do that. So let's divide it
into groups of 3. So let's see. Here is one group of
3, right over here. One group of 3. And now I have another group
of 3, so two groups of 3. And now I have
three groups of 3. Here's four groups of 3. Here is five groups of 3, six
groups of 3, seven groups of 3, and eight groups of 3. So if I were to take 24 things
and divide it into groups of 3, I get 8 groups. So we see that g-- let
me get my pen tool. We see that g, or I
could say 24 divided by 3 is 8, which must be equal to the
number of guests at the party. The other way of thinking
about it is I'm like, hey, some mystery
number here, g, that I'm trying to
figure out, the number of guests at the party
times 3 is equal to 24. So what times 3 is 24? Well, you could just think about
all the multiples of three. 3 times 1 is 3. 3 times 2 is 6. 3 times 3 is 9,
12, 15, 18, 21, 24. That's three times 1,
2, 3, 4, 5, 6, 7, 8. 3 times 8 is 24, so
g must be equal to 8, or 8 must be equal to g. Or we had exactly 8
guests at our party.