x-suma
I zi: x/4
II zi:
[tex]\frac{60}{100} \times (x - \frac{x}{4}) = \frac{3}{20} \times 3x = \frac{9x}{20} [/tex]
III zi: 150 lei
[tex]c) \frac{x}{4} + \frac{9x}{20} + 150 = x[/tex]
**aduci la numitor comun ca sa scapi de numitor
5x+9x+3000=20x
14x+3000=20x
14x-20x=-3000
-6x=-3000
[tex]x = \frac{ - 3000}{ - 6} [/tex]
x=500
[tex]a) \frac{a}{100} \times x = \frac{1}{4} \times x[/tex]
[tex]\frac{a}{100} \times 500 = \frac{1}{4} \times 500 \: | \div 500[/tex]
[tex] \frac{a}{100} = \frac{1}{4} [/tex]
a=100/4
a=25 %
b)
I zi-500/4=125 lei
II zi: 9×500/20=9×25=225
Cel mai mult a cheltuit in aII-a zi
