What Is The Least Number To Be Subtracted From 11, 15, 21 And 30 Each

1.	What Is The Least Number To Be Subtracted From 11, 15, 21 And 30 Each So That Resultant Numbers Become Proportional?
Answer» Let the least NUMBER to be subtracted be x, then 11 – x, 15 – x, 21 – x and 30 – x are in PROPORTION. <=> (11 – x) : (15 – x) = (21 – x) : (30 – x) => (11 – x)(30 – x) = (15 – x)(21 – x) From the OPTIONS, when x = 3 => 8 * 27 = 12 * 18 Let the least number to be subtracted be x, then 11 – x, 15 – x, 21 – x and 30 – x are in proportion. <=> (11 – x) : (15 – x) = (21 – x) : (30 – x) => (11 – x)(30 – x) = (15 – x)(21 – x) From the options, when x = 3 => 8 * 27 = 12 * 18

What Is The Least Number To Be Subtracted From 11, 15, 21 And 30 Each So That Resultant Numbers Become Proportional?

Answer»

Let the least NUMBER to be subtracted be x, then 11 – x, 15 – x, 21 – x and 30 – x are in PROPORTION.

<=> (11 – x) : (15 – x) = (21 – x) : (30 – x)

=> (11 – x)(30 – x) = (15 – x)(21 – x)

From the OPTIONS, when x = 3

=> 8 * 27 = 12 * 18

Let the least number to be subtracted be x, then 11 – x, 15 – x, 21 – x and 30 – x are in proportion.

<=> (11 – x) : (15 – x) = (21 – x) : (30 – x)

=> (11 – x)(30 – x) = (15 – x)(21 – x)

From the options, when x = 3

=> 8 * 27 = 12 * 18