I zi ----------
IIzi ----------/----------/----------
IIIzi ----------/ +56
I+II+III (zi) = 371
egalam segmentii
371-56=315
Aflam cat are un segment, adica cate paini s-au vandut in prima zi
315:5=63 paini
II zi - 63x3 = 189 paini
III zi - 63 + 56 = 119 paini
PROBA: 63+189+119=371