Question

7th grade math problem **** Sister of @zarkam21*****

Answer 1

Ryan used 12 sheets of paper today. This was 40% of the sheets he had. How many sheets did he have

Answer 2

@Vocaloid

Answer 3

\[1 \times 30\% = 1 \times 0.3 = 0.3\]

Answer 4

For this problem, we would have.
\[x \times 40\% = x \times 0.4 = 12\]

Answer 5

I would multiply 12 and 40/100

Answer 6

Then add the 12 and the answer together

Answer 7

Then it would just be a simple solve for x.

Answer 8

@zarkam21 Do you know how to solve for x?

Answer 9

No I''m in 7th grade we didnt learn that yet

Answer 10

We are just learning percents and how you subtract and/or add

Answer 11

No im her sister. She said I could use her avccount if I needed help with my homework

Answer 12

So you have never heard of isolating the variable?

Answer 13

NO :(

Answer 14

Hmm well x just represents a number that we're trying to figure out. That number in this case, is how many sheets of paper Ryan has. In order to do this, we need to display a true equation involving x.

x times 40% = 12

This is true, because 40% of the total number of Ryan's sheets is 12.

Answer 15

Okay and then from there?

Answer 16

From there, we solve for x. This is what we call, isolating the variable. See the equal sign? Consider that a wall that creates two sides, one on the left and right. We want x to be alone on one side. This involves something called order of operations, PEMDAS. Have you heard of this?

Answer 17

Yes last year

Answer 18

Paratheses
Exponents
Multiplication
Division
Addition
Subtraction

We only care about M and D right now. Consider multiplication and division to be "opposite" operations.

For example, 2 times 3 is 6
If can reverses this operation by doing 6 divided by 3, to get 2.

Answer 19

Learn it by Please Excuse My Dear Aunt Shameka
My math teacher was black, and told us she didn't have an aunt Sally. :/

Answer 20

so 12+2?

Answer 21

@Vocaloid Person with big brains is going to show you an easier way, since me teaching you a lot of algebra wouldn't be ideal, lol.

Answer 22

4.8?

Answer 23

sooo this method won't work every single time, but since we have easy numbers...

if 12 pages = 40% of the whole project

then we can half both numbers to get

6 pages is 20%, with me so far?

Answer 24

yes

Answer 25

20% is equivalent to 1/5

(since 20/100 simplifies down to 1/5)

so if 6 pages is 1/5 of the whole project, then 6*5 will give you the total number of sheets

Answer 26

30

Answer 27

yup, so 30 pages would be your sol'n

Answer 28

thank you