Question

Alin si-a propus sa citeasca o carte in primele 4 zile ale saptamanii,asfel

Answer 1

notam cu "a" paginile cartii
Luni: a×1/4
Marti: 3/6(a-a1/4)=3a/8
Miercuri: 1/2[a-(a-a1/4)]=1/2(a-3a/4)=1/2×a/4=a/8
Joi: 57 pagini
a/4+3a/8+a/8+57=a |×8
2a+3a+a+57×8=8a
6a+456=8a
8a-6a=456
2a=456
a=456:2
a =228 (pagini are cartea)