+0  
 
+10
988
7
avatar+509 

Please  help .. I understand it just need 16-26

 Feb 3, 2016

Best Answer 

 #6
avatar+129849 
+15

Let's look at 26.....let the denominator  = x

 

And the numerator is 5 less than 3 times this  =  3x - 5

 

So

 

[3x - 5] / x   = 4/8        [ 4/8   = 1/2]

 

[3x - 5] / x  = 1/2      cross-multiply

 

2[3x - 5]  = x    simplify

 

6x - 10  = x      subtract x from both sides and add 10 to both sides

 

5x  = 10     divide both sides by  5

 

x = 2     this is the denominator

 

And  3(2)  - 5   =  6 - 5  =  1

 

So....as Spawnnd rarinstraw said, the fraction = 1/2

 

 

 

cool coolcool

 Feb 4, 2016
edited by CPhill  Feb 4, 2016
edited by CPhill  Feb 4, 2016
 #1
avatar+2592 
+10

16. n=5

17.n=4.5

18. n=15

19. n=7.5

20.n=12

21. x=8/3

22. x=4

23. x=36

24. 2.5 rooms

25. 16 boys

26. 1/2

 Feb 3, 2016
 #2
avatar
0

17- 8:36=2:n. n=36/8 X 2 =9

 Feb 3, 2016
 #3
avatar+2592 
+7

36/8 is 4.5 guest

 Feb 4, 2016
 #4
avatar+5265 
+5

Sorry spawn, but your answer for #25 is wrong. It is 3 rooms.

 

To answer the questions:

16: n=5

17:n=9

18:n=15

19:n=7.5

20:n=16

21:X=8/3

22:x=9

23:x=36

24:Joan can paint 3 rooms in 7.5 hours.

25:There are 16 boys.

26:1/2

 

Hope this answers the questions! :)

 Feb 4, 2016
 #5
avatar
0

SpawnofAngel:

 

8:36 =2:9 

 

Divide 8/4=2

Divide36/4=9

 Feb 4, 2016
 #6
avatar+129849 
+15
Best Answer

Let's look at 26.....let the denominator  = x

 

And the numerator is 5 less than 3 times this  =  3x - 5

 

So

 

[3x - 5] / x   = 4/8        [ 4/8   = 1/2]

 

[3x - 5] / x  = 1/2      cross-multiply

 

2[3x - 5]  = x    simplify

 

6x - 10  = x      subtract x from both sides and add 10 to both sides

 

5x  = 10     divide both sides by  5

 

x = 2     this is the denominator

 

And  3(2)  - 5   =  6 - 5  =  1

 

So....as Spawnnd rarinstraw said, the fraction = 1/2

 

 

 

cool coolcool

CPhill Feb 4, 2016
edited by CPhill  Feb 4, 2016
edited by CPhill  Feb 4, 2016
 #7
avatar+2592 
+10

My bad guest, you're right

And rarin is as well, bit of a derp on my part

(ノ◕ヮ◕)ノ*:・゚✧ ✧゚・: *ヽ(◕ヮ◕ヽ)

 Feb 4, 2016

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