What is the least number to be subtracted from 11, 15, 21 and 30 each so that the resultant numbers become proportional?  Choose one.
A) 7	B) 6	C) 3	D) 4	E) 9
Let the least number to be subtracted be 'x', then 11 - x, 15 - x, 21 - x and 30 - x are in proportion.   &lt;=&gt; (11 - x):(15 - x) = (21 - x):(30 -x)(21 - x)   From the options, when x = 3   =&gt; 8 * 27 = 12 * 18 =&gt; then x = 3. =&gt; (11 - x)(30 - x) = (15 - x)(21 - x)   Answer: 3
<result>C</result>
What is the least number to be subtracted from 11, 15, 21 and 30 each so that the resultant numbers become proportional?