Add. \( \frac{3}{5}+\frac{7}{8}+\frac{3}{10} \) Enter your answer in the box as a mixed number in simplest form.

2. Quadrati rapidi Qual è il quadrato del numero 20 ?

1. Quante domande! Moltiplica un numero naturale per se stesso. Come si chiama il numero che hai ottenuto?

12 Men or 15 women can do a piece of work in 21 days. Find the number of days required to complete the same work by 6 men and 10 women.

13. A seller uses 930 gm in place of one kg to sell his goods. Find his actual \% profit or loss, when he sells his article on \( 3 \% \) gain on cost price : \( \begin{array}{ll}\text { (a) } 8 \frac{70}{93} \% & \text { (b) } 9 \frac{10}{93} \% \\ \text { (c) } 10 \frac{70}{93} \% & \text { (d) None of these }\end{array} \)

6. Se mezclan 1800 kg , de harina de 0,42 €/kg con 3500 kg de harina de \( 0,54 € / \mathrm{kg} \). ¿Qué precio tiene el kilo de la mezcla? SOLUCIón: \( 0,5 \in / \mathrm{kg} \);