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b, 3b+6c=480rb
2b+5c=..
substitusi kan a dn b
jadinya yg a kali 1, yg b kali 2 j
jadinyaa
6b+4c=480 rb
6b+12c=960rb
kurangkn a dan b
-8c = -480rb
c= 60rb
jadi 6b+4c=480rb
6b+4(60rb)=480rb
6b+240rb=480rb
6b=480rb-240rb
6b=240rb
b=40rb
2b+5c= 2(40rb)+5(60rb)
=80rb+300rb
=380rb