Asked by Paul

3000 Exercise books are arranged into 3 piles.The first pile has 10 more books than the second pile.The Number of books in the second pile is twice the number of books in the third pile.How Many books are there in the third pile?
Answered by Oscar
first look at what you know:

1) the TOTAL number of books IS 300
this tells you ADD
the answer will be 300

2) there are 3 piles
this tells you you will add
3 things

What do you NOT know?
the number of books in the
third pile
use the letter "x" for this

now try to put your problem together

pile 1 pile 2 pile 3

+ + x = 300

see if you can figure it out now.
Answered by Reiny
I would start with defining the

number of books in the third pile is x
then the number of books in the 2nd pile is 2x
and the first pile is then 2x+10

(I just translated the English to Math)

their sum is 300
x + 2x + 2x+10 = 300
5x = 290
x = 58

Third pile has 58 books

(2nd has 116 , the first has 126
check: 58+116+126 = 300)
Answered by Reiny
OOPS,
I read that as 300, should have been 3000
easy to fix

x+2x+2x+10 = 3000
5x = 2990
x = 598
Answered by Oga boga scharlet
It is 1495
Answered by Sadamaca nimrod
It is easy the easy way hard the hard way do not make fun of my last name because it actualy means noble man the answer is ::::::;;:;;::::::::::::::::::::::











1495
Answered by yah
Dunno

Answered by Someone
How ?
Answered by Japan
Can you do this with +×÷-
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