1. /20= /25=6/30 2. /27=8/36= /63 3. /8=15/ =24/32

1. n/20= m/25=6/30 
2. a/27=8/36= b/63
3. x/8=15/y =24/32

1. 
n/20=6/30 --- n=20x6/30=4
m/25=6/30 --- m=25x6/30=5

2
a/27=8/36 --- a=27x8/36=6
8/36= b/63 --- b= 63x8/36=14

3
x/8=24/32 --- x=8x24/32=6
15/y =24/32 --- y=15x32/24=20