Question 1106490
The numbers:  3x, 9x, 10x


Making the arithmetic progression:  3x, 9x, 10x+10


Common Difference between terms:
{{{9x-3x=(10x+10)-9x}}}
{{{6x=10x+10-9x}}}
{{{6x=x+10}}}
{{{5x=10}}}
{{{highlight(x=2)}}}


The three numbers (original numbers):  6, 18, 20