pliss , jawab..........

100%-20%=80%
7½=15/2
80/100 × 15/2 = 6kg

[tex]7 \frac{1}{2} = \frac{15}{2} \\ 20\% = \frac{20}{100} = \frac{1}{5} \\ jadi \: jumlah \: = \frac{15}{2} \times \frac{1}{5} = \frac{15}{10} \\ = 1.5 \\ sisa = \frac{15}{2} - \frac{3}{2} = \frac{12}{2} = 6[/tex]