Question

A+b+c+d=?
d=2/5 din c
d=b-75
b=6/10 din c
a=2/3 din (b+d) REPEDE CU METODA GRAFICĂ VĂ ROOOOG!

Answer 1

Răspuns:

1000

Explicație pas cu pas:

$d = \frac{2}{5} \times c = \frac{2c}{5}$

$d = b - 75$

$b = \frac{6}{10} \times c = \frac{3}{5} \times c = \frac{3c}{5}$

D=b-75=>

3c/5 - 2c/5=75 /×5

3c-2c=375

C=375

D=2*375/5= 2*75= 150

B=3*375/5 = 3*75= 225

$a = \frac{2}{3} \times (b + d) = \frac{2}{3} \times ( \frac{3c}{5} + \frac{2c}{5} ) = \frac{2}{3} \times \frac{5c}{5} = \frac{2}{3} \times c = \frac{2c}{3}$

a= 2*375/3 =2*125= 250

a+b+c+d= 250+225+150+375= 1000