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2014-06-02T16:20:04+03:00
A= 24  12x2
si be =24x3 apoii faci 300 minu cat iti da  24x3= 12x2 siti iti da b


2014-06-02T16:20:30+03:00
A/2=b/2+12  |*2
a=b+24
3a+3b=300
a+b=100
b+24+b=100
2b=100-24
2b=76
b=38
a=38+24
a=  62