Odpowiedź:
[tex]3. \\ 150 = 100\% \\ 60 = x \\ 150 \times x = 60 \times 100 \\ 150x= 6000 \\ x = 40 \\ 200 = 100\% \\ 70 = y \\ 200 \times y = 70 \times 100 \\ 200y = 7000 \\ y = 35[/tex]
[tex]4. \\ 500 \times 0.21 = 105 \\ 500 - 105 = 395kg \\ 2300 \times 0.37 = 851 \\ 2300 - 851 = 1449l[/tex]
[tex]5. \\ 50 \times 0.3 = 15 \\ 50 + 15 = 65 \\ 5 \times 0.1 = 0.5 \\ 5 - 0.5 = 4.5[/tex]
[tex]6. \\ 30\% = 12 \\ 100\% = x \\ 30 \times x = 12 \times 100 \\ 30x = 1200 \\ x = 40 \\ 45\% = 90 \\ 100\% = y \\ 45 \times y = 90 \times 100 \\ 45y = 9000 \\ y = 200[/tex]
[tex]7. \\ 300 = 100\% \\ 60 = x \\ 300 \times x = 60 \times 100 \\ 300x = 6000 \\ x = 20 \\[/tex]
