Question

exercitiul 3... e de clasa a 8-a

Answer 1

$Ana-a \\ Bianca-b \\ a+b=24 \\ a-3=\frac{b+3}{5} \\ 5(a-3)=b+3 \\ 5a-15=b+3 \\ 5a=b+3+15 \\ 5a=b+18 \\ a=\frac{b+18}{5} \\ \\ a+b=24 \\ \frac{b+18}{5} + b=24 /*5 \\ b+18+5b=120 \\ 6b+18=120 \\ 6b=120-18 \\ 6b= 102 \\ b=102:6 \\ b=17 \\ \\ a+b=24 \\ a+17=24 \\ a=24-17 \\ a=7$