Question

I think of a number, add 7 and then multiply by 4 my answer is 80. What was my number?

Answer 1

Any ideas?

Answer 2

Any ideas?

Answer 3

Lol

Answer 4

My turn
Any ideas?

Answer 5

um x+28=80, 4(x+7)=80, 4x+7=80, 4x+28=80 Explain your answers, and then find the value of X !

Answer 6

Which one do you think it is @akem?

Answer 7

4(x+28) = 4(x) + 4(28)
NOT 4(x) + (28)

Answer 8

So which one do you think it is

Answer 9

Well @Skullpatrol i think it could be all of them i'm just not sure how to really explain it and just so you know this is High level !

Answer 10

4(x+7)=80
x+7=80/4=..
x=...

Answer 11

Start by letting the number you are thinking of be called x.

Let x = the number

Answer 12

so then would X = 20 since 80/4=20 ?

Answer 13

nope.

Answer 14

@Sshayer ?

Answer 15

why not @skullpatrol ?

Answer 16

x+7=20
x=...

Answer 17

What about the "add 7" part @akeem?

Answer 18

Your initial equation was correct.
4(x+7)=80
(x+7) = 80/4

Answer 19

@Mhchen i thought of a number then i multiplied it by 4 what was my number ?

Answer 20

No it was
"I thought of a number, add 7, multiplied it by 4, my answer is 80"

Answer 21

yea mybad

Answer 22

Yeah, so according to that wording, you added 7:
x+7
Then you multiplied by 4
4 * (x + 7)
Then that whole thing is 80
4 * (x+7) = 80

So then you can dividing BOTH sides by 4.
x + 7 = 80 / 4

Then you can subtract BOTH sides by 7.
x = (80/4) - 7

Do you know how to simplify it from here?

Answer 23

yea i think so know i just do 80/4-7 right ?

Answer 24

which is 13 so X=13 ?

Answer 25

$$\huge \text{Good job!}$$

Answer 26

@skullpartrol thank you for helping

Answer 27

@mchen thank you as well

Answer 28

Thanks for trying to learn :-)

Answer 29

Welcome !