Question

de la 16 la 20
VA ROOG DAU COROANA SI 82 DE PUNCTE

Answer 1

16.
x=nr elevi
x*10%=10x/100=x/10=elevi corijenti
x/10 * 1/3= x/30=corijenti la mate
2=corijenti la romana
x/30+2=x/10
x+60=3x
2x=60
x=30 elevi

17.x=nr
20% * x = 20x/100=x/5 
x-x/5=16
5x-x=80
4x=80
x=20

18.
P=124
2L+2l=124
L+l=62
l=24% *L =24L/100=6L/25
6L/25+L=62
6L+25L=1550
31L=1550
L=50
l=6*50/25=12

19.
100%+5%=105%   dupa primul an
105% *5% =  5,25 dobanda dupa al 2-lea an
105%+5.25%=110,25% 
6615:110,25%= 6615 x100/110,25=6000 lei suma initiala

sau
100%+5%=105%
6615:105%=6300 lei   
100%+5%=105%  
6300:105%=6000 lei  suma initiala

20.
100%+6%=106%
106% * 6%=6.36%
106%+6.36%=112,36%
247,20:112,36%=220 lei suma initiala

verificare
220 x6%=13.20
220+13.20=233.20
233.20 *6%=14.00
233.20+14=247,20 lei