Question

Aflati un numar x stiind ca :

a) 10% din el este 40
b) 25% din el este 900
c) 80% din el este 1040


Multumesc !!!

Answer 1

10/100*x=40
1/10*x=40
x=40*10=400

25/100*x=900
1/4*x=900
x=900*4=3600

80/100*x=1040
8/10*x=1040
4/5*x=1040
x=1040*5/4=5200/4=1300

Answer 2

a)[tex]\frac{10}{100}x=40\frac{x}{10}=40 x=10x40x=400 [/tex]

b)[tex]\frac{25}{100}x=900\frac{1}{4}x=90 \frac{x}{4}=900 x=900x4 x=3600 [/tex]

c)[tex]\frac{80}{100}x=1040\frac{4}{5}x=1040\frac{4x}{5}=1040 4x=5x1040 4x=5200 x=5200:4x=1300[/tex]