13 Celia works in a candy shop, A customer wants 3 pounds of candy priced at \( \$ 4 \) per pound mixed with \( 2 \frac{1}{2} \) pounds of candy priced at \( \$ 3.50 \) per pound. Find the value of the mixture. How much is the mixture worth per pound?

11. If the average (arithmetic mean) of five numbers is 4 and if four of the numbers are \( 1,3,5 \), and 7 , what is the fifth number? \( \begin{array}{llll}\text { (A) }-1 & \text { (B) } 0 & \text { (C) } & \text { (D) } 6\end{array} \) (E) 9 \( \$ \begin{array}{l}\text { (D) }\end{array} \)

What is 100 degrees Celsius equal to in Fahrenheit?

What is the conversion of 39 degrees c to f ?

3.1. Simplify each of the following ratios: 3.1.1. \( 4: 28: 16 \) 3.1.2. \( 6: 1.25: 2.5 \) 3.1.3. \( 3.6: 27: 13.5 \) 3.2. Distribute \( R 24000.00 \) in the ratio 2:1:5.

Ejercicio 2: Cinco carpinteros necesitan 21 días para entarimar un suelo. ¿Cuántos carpinteros seran necesarios si se desea hacer el trabajo en 15 dias?