Question 1205950
---
 He painted 1 3/4 of the pole red. 
---


That number needs the unit stated clearly.  The pole alone is only 7 meters.



=============================================
pole measuring 7 m. He painted it red, yellow and black. He painted 1 3/4 METERS of the pole red. The length of the black part was 3/4 of the length of the yellow part. What was the length of the pole that was <s>poured</s> PAINTED black?
=============================================


Not the only way to assign a variable, but this is literally according to the description:
<pre>
COLOR          AMOUNT_in_meters
black            {{{(3/4)y}}}
red             {{{1&3/4}}}
yellow             y
SUM               7
</pre>
{{{highlight_green(3y/4+7/4+y=7)}}}

-

{{{3y+7+4y=28}}}

{{{7y+7=28}}}

{{{y+1=4}}}

{{{highlight_green(y=3)}}}-----------the length of yellow part


The black part is  {{{(3/4)*3=9/4=highlight(2&1/4)}}} {{{meters}}}.



--
--