Since this answer is in <em>Quadrant</em><em> </em><em>I</em>,<em> </em>this would be a positive-positiveanswer, which in this case, will remain a positive.
Lets take the info already given. 20 is on the larger triangle and 8 is on the smaller. So the side that matches with X is 6. The relationship between 20 and 8 is 2.5. How? 20/8=2.5. then you divide 6 by 2.5. That equals 2.4. So x=2.4. Hope that helps !