tolong di jawab pakai cara secepatnya

1.
[tex]7 \frac{1}{2} = \frac{15}{2} [/tex]
jika satu kantong berisi 1/4 maka:
[tex] = \frac{15}{2} \div \frac{1}{4} \\ = \frac{15}{2} \times \frac{4}{1} \\ = \frac{60}{2} \\ = 30 \: bungkus[/tex]
2.
4,2km = 4200 m
maka:
[tex] = \frac{4200}{50} \\ = \frac{420}{5} \\ = 84 \: bendera[/tex]
3.
[tex]8 \frac{1}{2} = \frac{17}{2} [/tex]
karena masing masing membutuhkan 25% maka:
[tex] = \frac{17}{2} \div \frac{25}{100} \\ = \frac{17}{2} \times \frac{100}{25} \\ = \frac{1700}{50} \\ = \frac{170}{5} \\ = 34 \: desa[/tex]

4.
[tex]6.5 = \frac{65}{10} [/tex]
maka:
[tex] = \frac{65}{10} \div \frac{1}{4} \\ = \frac{65}{10} \times \frac{4}{1} \\ = \frac{260}{10} \\ = 26 \: pelanggan[/tex]
5.
[tex]3 \frac{1}{2} = \frac{7}{2} [/tex]
maka:
[tex] = \frac{7}{2} \div \frac{1}{4} \\ = \frac{7}{2} \times \frac{4}{1} \\ = \frac{28}{2} \\ = 14 \: orang[/tex]