transformam m in dm
936m=9360dm
ziua a =7050 dm
9360dm-7050dm=2310 dm(restul )
2310=ziua b+ziua c
ziua c=ziua b+105 m
inlocuim si obtinem :b+b+105=2310 dm
2310dm=23100 cm
105m=10500 cm
2*b=23100-10500
2*b=12600
b=12600/2
b=6300 cm (ziua b)
c=6300+10500=16800cm(ziua c)