Question 1079756
A box contains some red ,yellow and blue counters. The ratio of the number of red counters to that of yellow counters is 2:3. The ratio of the number of blue counters to that of red counters is 4:7. <b>What fraction of the counters are yellow </b>
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Fraction of counters YELLOW,  {{{highlight(21/43)}}}.


<pre>
red     yellow     blue
-----------------------------
 2        3
-----------------------------
 7                  4
-----------------------------
</pre>

Find the slot for yellow in the second row using  {{{(7/2)*3=21/2}}}.
<pre>
red     yellow     blue
-----------------------------
 2        3
-----------------------------
 7       {{{21/2}}}     4
-----------------------------
</pre>


<pre>
  RED     YELLOW    BLUE
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  14        21       8         total 43 parts
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</pre>