jalan jwb ny gmna mksih

K = 4 x s
42 = 4 x s
s = 42 : 4
s = 10,5


KL/OP = 2/3 atau LM / PQ = 2/3
=> X / 10,5 = 2 / 3
=> 3.X = 10,5 . 2
=> 3X = 21
=> X = 21 : 3
=> X = 7

jawabannya yg A. 7