Question

sase fete si trei baieti planteaza 39 de panselute.o fata planteaza cu doua panselute mai mult decat un baiat.cate panselute planteaza o fata?

Answer 1

6f+3b=39
f=b+2
6(b+2)+3b=39
6b+12+3b=39
9b=39-12
b=27:3
b=3 panseluta planteaza un baiat
f=3+2=5 panselute planteaza o fata

verificare 6x5+3x3=39 panselute

Answer 2

6f+3b=39panselute;
⇒f=2+b;
⇒6f=6[2+b]
⇒12+6b;
⇒12+6b+3b=39
⇒12+9b=39
⇒9b=39-12
⇒9b=27
⇒b=3[panselute-planteaza un baiat];
⇒f=2+3
⇒f=5[panselute planteaza o fata];