Question

dau coroana la răspunsul correct ( mâine)​

Answer 1

Răspuns:

2a=3b=5c ⇒ b=$\frac{2}{3}$ a; c=$\frac{2}{3}$a

a+b+c=620

a+$\frac{2}{3}$ a+$\frac{2}{5}$a=620

$\frac{15a+10a+6a}{15}$=620

31a=620*15

31a=9300

a=300

b=$\frac{2}{3}$*300=200

c=$\frac{2}{5}$*300=120

Explicație pas cu pas:

Answer 2

{x,y,z} i.p. {2,3,5}

x+y+z= 620

x,y,z= ?

2x=3y=5z=k => x=1/2k; y=1/3k; z=1/5k

1/2+1/3+1/5=620

1/2 se amplifica cu 15

1/3 cu 10

1/5 cu 6

15+10+6/(totul pe )30= 620

31/30=620

k= 30*620/31 (simplificam 620 cu 31)

k= 600

x= 600*1/2

x=300

y=1/3*600

y=200

z= 600*1/5

z=120