please caranya ya nomer 7 am 8

7). A/B = 2/3
BC = 4/5
C=30
B/C=4/5
B/30=4/5
5B=120
B=24
A/B=2/3
A/24=2/3
3A=48
A=16
A+B+C= 16+24+30 = 70
8). K:U:S = 5:2:7
S-U=110
S=110+U
U/S=2/7
U/110+U=2/7
7U=220+2U
5U=220
U=44
S=110+U
S=110+44
=154
K/U=5/2
K/44=5/2
2K=220
K=110
K+U+S
110+44+154= 308