Answer:
1.5:4:3=48,000
5n+4n+3n=48,000
12n=48,000
n=48,000/12
n=4000
5(4000)=20,000
4(4000)=16,000
3(4000)=12,000
2.2n : ln : 3n = 324
6n=324
n=324/6
n=54
2(54)=108
1(54)=54
3(54)=162
3.2n : 3n : 5n = 120
10n=120
n=120/10
n=12
2(12)=24
3(12)=36
5(12)=60