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b = a+500
(a+b)/2 = 3000
a+b = 6000
a+a+500 = 6000
2a = 5500
a = 2750
b = 2750+500 = 3250
9.
a = x-30
a+5+x+5 = 46
a+x = 36
x-30+x = 36
2x = 66
x = 33
a = 33-30 = 3
10.
200x + (18-x)*500 = 5400
200x + 9000 - 500x = 5400
9000-5400 = 500x-200x
3600 = 300x
x = 12
jadi ada 12 keping uang logam dua ratusan & 6 keping uang logam lima ratusan