Răspuns:
a) Vp= volum puzzle
Vp= h x L x l
Vp= 4x20x30=2400 cm3
b) Vc= volum cutie
Vc=40x80x60= 192000 cm3
192000 : 2400=80 puzzzle in cutie
c) 80x5 =400 puzzle s. au vândut
S1= prima saptamana
S2= a doua saptamana
S3= a treia saptamana
S1+S2+S3=400
S2= S1-10
S3=3x S1
S1+S1-10+3S1=400
5S1=400+10=410
S1 =410:5=82 puzzle. uri vandute in prima saptamana
S2=82-10=72 puzzle. uri vandute in a doua saptamana
S3=82x3=246 puzzle. uri vandute in a treia saptamana
d) 65% din 1000
65/100x1000=650 piese surorile
(650-78):2=291 piese sora Matildei
291+78=369 piese Matilda
1000-650=350 piese prietenii
P1= unul dintre prieteni
P2 = cel de al 2 lea prieten
P1+P2= 350
P1=P2x6
6P2+P2=350
7P2 =350
P2=350:7
P2=50 piese cel. de al. 2 lea prieten
P1=6xP2
P1=6x50
P1=300 piese primul prieten
