Чи правильні пропорції а) \( 3,9: 5,2=6: 4,5 ; \) б) \( 6,25: 2 \frac{1}{2}=5,75: 2 \frac{3}{10} \) ? али) Знайти невідомий член пропорціїі а, \( 4: x=0,6: 5 ; \) б) \( \frac{1}{4}: 1 \frac{3}{8}=2 \frac{2}{3}: x \)

5.-Realiza las siguientes operaciones dando el resultado como fracción: \[ \begin{array}{lll}\text { a) } 3,6+\frac{4}{5}-2,08= & \text { b) } 0,3+\frac{2}{9}-0,7= & \text { c) } 3,23-3,23=\end{array} \]

A company is going to have a dinner party in a restaurant for its top employees. The restaurant is going to charge them \( \$ 280 \) for the use of their function room, plus \( \$ 40 \) per dinner. The company has a budget of no more than \( \$ 1500 \). What is the greatest number of people they can invite to this dinner? o 30.5 people o 31 people o 30 people o 37 people

c) \( 3,23-3,23= \)

Convince Me! Use Structure Dario says, "I can find \( 9 \times 0<3 \times 1 \) without computing. I can think about properties that I know." What could he mean?

1. \( \frac{2}{3}+\frac{5}{3} \)