\( \begin{aligned} 42 \text { days } & =42 \times 1 \text { day } \\ & =42 \times\left(\frac{\square}{\square} \text { week }\right)\end{aligned} \)

6. Talet 113 är skrivet \( i \) bas 7 . Skriv talet \( i \) bas 10 . Redovisa din lösning.

Resolver las siguientes sumas agrupándolas de distinta forma (PROPIEDAD ASOCIATIVA) a) \( 13+17+36= \) b) \( 354+1+245= \)

14. A consignment of fodder can feed 1000 sheep for 20 days. Assuming that all the sheep consume the fodder at the same rate, how many consignments of fodder are needed to feed 550 sheep for 400 days? 15. Tap A takes 6 minutes to fill a tank and Tap B takes 9 minutes to fill the same tank. Pipe \( C \) can empty the tank in 15 minutes. How long will it take to fill up the tank if the pipe is in use when both taps are turned on? 16. contractor agrees to lay a road 3000 m long in 30 days. 50 men are employed and they work for 8 hours per day. After 20 working days, he finds that only 1200 m of the road is completed. How many more men does he need to employ in order to finish the project on time if each man now works 10 hours a day?

\( \begin{array}{ll}\text { 1- HALLAR LA EXPRESION DECIMAL DE CADA FRACCION } \\ \text { 1. } \frac{3}{5}= & \begin{array}{l}\text { 4. }-\frac{4}{9}= \\ \text { 2. } \frac{3}{40}= \\ \text { 5. } \frac{25}{6}= \\ \text { 3. } 153\end{array} \\ \text { 6. }-\frac{5}{18}=\end{array} \)

8.) \( \frac{1}{8} \div \frac{2}{3}=\square \)