Question

va rog mult, este urgent ​

Answer 1

Răspuns:

18.

1,2 lei _____ 100%

x ________ 140%

x=(1,2•140)/100=168/100=1,68 lei

19.

15•10 _____ 100%

y _________ 90%

y=(150•90)/100=135 lei =>prețul unei agende este de 13,5 lei

20.

3 mil. _______ 100%

z ___________ 116%

z=(3.000.000.•116)/100=3.480.000 lei

21.

1 leu _____ 100%

p ________ 110%

p=110/100=1,1 leu

20 : 1,1 = 18,(18) caiete

22.

8% _____ 32 kg

100% ____ x

x=(100•32)/8=400 kg

23.

3 probl. ____ 20%

y _________ 100%

y=300/20=15 probl.

24.

x _________ 100%

x-6 _______ 95%

95x=100x-600

5x=600

x=120 lei prețul

26.

z ____________ 100%

z+50 _________ 116%

116z=100z+5000

16z=5000

z=312,5 lei