10) El cociente al simplificar la fracción es: \[ -\frac{3}{5} \div \frac{3}{6}= \] \( \begin{array}{llll}\text { a. } \frac{3}{10} & \text { b. }-\frac{7}{6} & \text { c. }-\frac{6}{5} & \text { d. } \frac{9}{11}\end{array} \)

Use Structure Suppose Ms. Bush charges \( \$ 4 \) per baseball. Would each team pay more if there are 6 teams or 9 teams? Compare by writing the symbol \( >,< \), or \( = \). Tell how to decide without computing.

d. \( 1-\left[\frac{4}{5}+\left(-\frac{2}{21}-\frac{8}{14}\right)-\left(\frac{4}{3}-\frac{11}{5}+1\right)\right]+\frac{15}{6}-\left(3+\frac{7}{9}-\frac{5}{3}\right)+1 \).

Rafael wants to buy the same number of gift bags and bows. Gift bags are sold in packs of 6 . Bows are sold in packs of 9 . What is the least number of gift bags and bows that Rafael can buy?

Sinhle's mom gave him \( R_{20} \) to go to the shop. He buys a coke for R Rot a lollipop for \( R_{2} \) and a packet of chips for \( R_{55} \). What is his change? Show your calculations below.

3. O preço da gasolina nas refinarias é de \( R \$ 2,08 / \) litro, o que significa um reajuste de \( +4,0 \% \) em relaçäo aos valores anteriores. Na bomba, essa gasolina, após a inserção de todos os impostos e lucro do posto, passa a custar \( R \$ 5,72 / \) litro. a. Qual era o preço da gasolina nas refinarias antes do aumento?