2.
6/8 = [ w - 5 ] / w cross-multiply
6w = 8 [ w - 5 ]
6w = 8w - 40 subtract 8w from both sides
-2w = -40 divide both sides by -2
w = 20
w - 5 = 15
To find one missing side in the second figure that would be the couter-part to the side of 9 in the first figure we have that
Missing side/ w = 9/8
Missing side 20 = 9/8 multiply both sides by 20
Missing side = 20 * 9 / 8 = 180 / 8 = 22.5
And to find the last missing side of the second figure that is a counter-part to the side of 14 in the first figure we have that
Missing side / 22.5 = 14/ 9
Missing side = 22.5 * 14 / 9 = 35
