<PRE><B>Question 990472</B>
.
If &amp;nbsp;90%&amp;nbsp; of some quantity is &amp;nbsp;63, &amp;nbsp;this means that


{{{90/100}}}.{{{x}}} = {{{63}}} &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;(by the definition of percentage). 


Then &amp;nbsp;{{{x}}} = {{{(63*100)/90}}} = {{{(63*10)/9}}} = {{{7*10}}} = 70.


So, &amp;nbsp;the quantity is &amp;nbsp;70.


10% &amp;nbsp;of &amp;nbsp;70 &amp;nbsp;is &amp;nbsp;{{{10/100}}}.{{{70}}} = {{{1/10}}}.{{{70}}} = {{{7}}}.


Is it clear?


</PRE>