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30K÷3K=10
2)2X-X/2=54
4X-X/2=54
3X=108
X=36
3)B=2H
2(2H+H)=30
2(3H)=30
6H=30
H=5
B=10
4)M=2H
N=3(M+H)
N+M+H=96
3M+3H+2H+H=96
3(2H)+6H=96
6H+6H=96
12H=96
H=8
M=2H=2(8)=16
N=3(H+M)=3(8+16)=3(24)=72
5)B=40+C
A=B+40=80+C
A+B+C=180
80+C+40+C+C=180
3C+120=180
3C=60
C=20
B=60
A=100