+0  
 
0
106
5
avatar+176 

a : b = 9:4   and   10b = 7c 

  work out   a:c   in its simplest form

jakeharris02  Apr 22, 2018
 #1
avatar+2765 
+1

Hmm, let me try this one.

We know that a:b=9:4, and 10b=7c, so that means b:c=10:7

a:b=9:4

c:b=7:10   Find the LCM of 4 and 10, which is 20.

 

So, a:b=45:20

c:b=14:20

Thus, the answer is 45:14

tertre  Apr 22, 2018
 #2
avatar+2117 
+1

 

Ok, Tertre fixed his error, and his answer looks right now!

TheXSquaredFactor  Apr 22, 2018
edited by TheXSquaredFactor  Apr 22, 2018
edited by TheXSquaredFactor  Apr 22, 2018
 #3
avatar+2765 
+3

is  this correct?

10b=7c, b=7/10c

 

So, 4x=7/10c, x=7/10/4=7/10*1/4=7/40c

9x=7/40*9=63/40c.

a=63/40c

 

Wait, so is it 63:40?

tertre  Apr 22, 2018
 #4
avatar+87301 
+1

Thanks, tertre  and X2    !!!

 

 

cool cool cool

CPhill  Apr 22, 2018
 #5
avatar+2765 
+1

Welcome, CPhill! smileysmiley

tertre  Apr 22, 2018

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