Question

What number must be subtracted from each of the numbers 13, 9 , 8 and 6 to get the numbers which are in proportion​

Answer 1

Answer:

6

Step-by-step explanation:

Let x be subtracted,

13-x, 9-x, 8-x, 6-x

Now these are in proportion

(13-x):(9-x)::(8-x):(6-x)

= (13-x)(6-x)=(9-x)(6-x)

= 78-13x-6x+x²=54-9x-6x+x²

=78-19x=54-15x

=78-54=19x-15x

=24=4x

=> x=6