Question

Trei grupe de elevi au strans 170 kg plante medicinale. Prima grupa a strans cu 20 kg mai putin decat a doua, iar a treia a strans cat a doua + 10000 g . Cate kg de plante medicinale a strans fiecare grupa?

Answer 1

10000g=10kg
a+b+c=170
a=b-20
c=b+10
b-20+b+b+10=170
3b=170+20-10
b=180:3
b=60 kg a strans a2a grupa
a=60-20=40 kg a strans prima grupa
c=60+10=70 kg a strans a3a grupa

verificare 60+40+70=170 kg

Answer 2

x+y+z=170kg
x=y-20kg
z=y+10000g
10000g=10kg

y-20+y+y+10=170
y-20+2y=170-10
y-20+2y=160
3y-20=160
3y=160+20
3y=180
y=180:3
y=60kg

x=60-20=40kg
z=60+10=70kg