Question

Susan is reading a book. The number of pages before the page she is reading is equal to 1/10 the number of pages after. If she reads 90 more pages, the number of pages before that page equals the number of pages after. Find the total number of pages of the book.

i even don't understand what does the question is saying....
@Peter14

Answer 1

let a be the number of pages she has read and b be the number of pages left

Answer 2

set up a system of equations...

Answer 3

can we use one unknown? or, just go on?

Answer 4

90/100 = 0.9
so, 0.9*10 =9
9+1 = 10
so, 10+90 = 100
100+100 = 200
so, the book has 200 pages.

Answer 5

wow, so many people...

Answer 6

@ryanvarghese12790 sorry the answer is more than 200..

Answer 7

I am hoping this is right.

Answer 8

sorry, then I am out

Answer 9

10*a=b
(a+90)=(b-90)

Answer 10

@ryanvarghese12790 never mind :)

Answer 11

@Peter14 ok just ignore me xdd. go on then. let me see...

Answer 12

Look !
We have a Proportion !
we have 1/10 means difference is 10-1=9
Then :
1___________x
10______-y
9_______90
Have :
10*10=100
and : 1*10=10
So sum them :
100+10=110
Got it ?:)
@kryton1212

Answer 13

@E.ali i am sorry. the answer is not 110.....

Answer 14

Ohhhh ....
yea ....
I have a bigggggggggg fall ... Sorry !!!
Just a min !...

Answer 15

@E.ali never mind :D no need to apologize :)

Answer 16

10*a=b
(a+90)=(b-90) ==>> a+180 = b
a+180 = 10a

Answer 17

@kryton1212 you got it from here

Answer 18

Yeah !
Look if we reduce from a thing another will be more !

Answer 19

well.....

Answer 20

For example :
a+b=8
If have a-4 have b+4 :
a-4+b+4=8
Got it ?

Answer 21

a=20
b=200

and include the first page

20+200+1=221?

Answer 22

ohh thank you @E.ali and @Peter14 so much

Answer 23

sure, include the first page

Answer 24

Yea !

Answer 25

thanks ;D

Answer 26

;)