It's D. Slopes are the same, because if you divide opposite and adjacent side of both triangles, you get the same result. Count the squares, for the smaller triangle it's 2/2=1 and for the bigger one it's 4/4=1.
First of all 1+2=3 which leads to 6:3x=1 3x=6:1 3x=6 X=2
D. Because 5 and 5 could land on any