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a = tinta
b = pena
2a = 4b
a = 4/2b
a = 2b
5a+3b = 195.000
5(2b)+3b = 195.000
10b+3b = 195.000
13b = 195.000
b = 195.000÷13
b = 15.000
a = 2b
= 2×15.000
= 30.000
3a+6b = 3(30.000)+6(15.000)
= 90.000+90.000
= 180.000 (B)