a) As STU ~ PQR then

6/4 = 12/x

4/6 = x/12

x = 12 * 4/6

x = 2 * 4

x = 8

Hence x = 8

b) As BCDE ~ WXYZ then

XW/BC = YZ/ED

6/4 = YZ/6

YZ = 6 * 6/4

YZ = 36/4

YZ = 9

then

WZ = 3 + CD

WZ = 3 + 3

WZ = 6

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