Answer:
1)
, 2) Seis pares de zapatos (Six pairs of shoes), 3)
![x = (33)/(4)\,kg](https://img.qammunity.org/2021/formulas/mathematics/high-school/7lbx679h1slxcxe4jdc43i1ttz0la4gwmr.png)
Explanation:
1) La cantidad de arroz no utilizada por Juanita es (The quantity of rice that was not used by Juanita is):
![x = (15)/(20)\,kg + (1)/(4)\,kg - (11)/(20)\,kg](https://img.qammunity.org/2021/formulas/mathematics/high-school/p7fj7o86klmlrwvqio6ypxg7g29g9ec3g3.png)
![x = (4)/(20)\,kg + (1)/(4)\,kg](https://img.qammunity.org/2021/formulas/mathematics/high-school/4cn9l6ttkjsop7j9f3xdc07yuf1em1rwf6.png)
![x = (1)/(5)\,kg + (1)/(4)\,kg](https://img.qammunity.org/2021/formulas/mathematics/high-school/1oitc37cw2u6p750kn538rv5fbdkct4p45.png)
![x = (9)/(20)\,kg](https://img.qammunity.org/2021/formulas/mathematics/high-school/qjmnpzh2osw4zsnt4uj6fugnc2wxvn9wyn.png)
2) La cantidad de docenas sin vender es (The quantity of dozens of shoes that are not sold is):
![x = 2 - (2)/(3)-(3)/(12) -(4)/(6)](https://img.qammunity.org/2021/formulas/mathematics/high-school/q8c9bjr83kuty86yvd16pahxe3ahvrwe1y.png)
![x = 2 -(2)/(3) - (1)/(4)-(2)/(3)](https://img.qammunity.org/2021/formulas/mathematics/high-school/p8nkpsmfj02trphwelxu7a96hlreddebep.png)
![x = 2 -(4)/(3)-(1)/(4)](https://img.qammunity.org/2021/formulas/mathematics/high-school/5w0yxg125y3gepr1ic3a8v98ly3eao83ew.png)
![x = 2 -(16+3)/(12)](https://img.qammunity.org/2021/formulas/mathematics/high-school/qq5kotqcp3t5le6ykjxvhgttjl8uwfry7p.png)
![x = 2-(18)/(12)](https://img.qammunity.org/2021/formulas/mathematics/high-school/tljmmeme1ufggvt2nmon4wk3ox5mincye8.png)
![x = 2 - (3)/(2)](https://img.qammunity.org/2021/formulas/mathematics/high-school/woy8wca1npujof6jlhhu41bklaqoo2l1nj.png)
![x = (1)/(2)](https://img.qammunity.org/2021/formulas/mathematics/middle-school/1kwnbk7q4emvcjmp0vlw6vem8ddl1a5rcz.png)
Hay seis pares de zapatos (There are six pairs of shoes).
3) El peso total de las frutas son (The total weight of fruits are):
![x = 4\,kg + (3)/(4)\,kg + (1)/(2)\,kg +3\,kg](https://img.qammunity.org/2021/formulas/mathematics/high-school/zt21roka2qnvfuhzgz6hihxc4ra2rytz28.png)
}
![x = 7\,kg + (10)/(8)\,kg](https://img.qammunity.org/2021/formulas/mathematics/high-school/dn47hgfvvxszczcvzggh2w77kdrfn17hb0.png)
![x = 7\,kg + (5)/(4)\,kg](https://img.qammunity.org/2021/formulas/mathematics/high-school/t0k17o9n1vs202oxxwe9lyd8wdpfue08ge.png)
![x = (28+5)/(4)\,kg](https://img.qammunity.org/2021/formulas/mathematics/high-school/2tpq1djsptt9itovctu81hkbi69h9b7xp1.png)
![x = (33)/(4)\,kg](https://img.qammunity.org/2021/formulas/mathematics/high-school/7lbx679h1slxcxe4jdc43i1ttz0la4gwmr.png)