10.
[tex]25\% \times 30 = \frac{25}{100} \times 30 = \frac{25 \times 30}{100} = \frac{750}{100} = 7.5 \: baieti[/tex]
30-7,5=22, 5 fete.
Probabil nu au realizat cand ai facut problema.
11.
21+9=30 elevi
[tex]x\% \times 30 = 9 \\ \frac{x}{100} \times 30 =9 \\ \frac{30x}{100} = 9 \\ 30x = 900 \\ x = \frac{900}{30} = 30\% \: baieti[/tex]
[tex]y\% \times 30 = 21 \\ \frac{y}{100} \times 30 = 2 \\ \frac{30y}{100} = 21 \\ 30y = 2100 \\ y = \frac{2100}{30} = 70\% \: fete[/tex]
12.
[tex]6\% \times 1200 = \\ \frac{6}{100} \times 1200 = \\ \frac{6 \times 1200}{100} = \\ \frac{7200}{100} = 72 \: lei \: dobanda[/tex]
[tex]1200 + 72 = 1272 \: lei \: va \: avea \: dupa \: un \: an[/tex]
