caranya nomer 1 dan 2 plis jawab?

1.
misal KQ = m
MK / PQ = KL / QL
18 / 15 = (20 + m) / 20
15(20+m) = 18 x 20
300 + 15m = 360
15m = 360 - 300
15m = 60
m = 60 / 15
m = 4

maka KQ = 4

2.
misal RS = m
TS / QP = RS / RP
15 / 20  = m / (m + 18)
15 (m+18) = 20 m
15m + 270 = 20m
20m - 15m = 270
5m = 270
m = 270 / 5
m = 54

maka RS = 54