If 20 lb of rice and 10 lb of potatoes cost \( \$ 16.60 \), and 30 lb of rice and 12 lb of potatoes cost \( \$ 23.52 \), how much will 10 lb of rice and 50 lb of potatoes cost? Let \( x \) be the cost of 1 lb of rice and \( y \) be the cost of 1 lb of potatoes. Set up two linear equations from the given information using \( x \) and \( y \) as the variables. \( \square=16.60 \) \( \square=23.52 \) (Do not factor. Use integers or decimals for any numbers in the equations.)

Pedro y Juan tienen entre ambos \( \$ 45.000 \). Si Pedro tiene el triple de Juan. ¿Cuánto dinero tiene Juan?

3. Mathon went to Inkhorn Bookstore where he got a discount of P15 from a book that was marked \( 20 \% \) off. Then, he went to Lofty Bookstore to check out one of their limited edition books that is now discounted at \( 30 \% \). If Mathon got a discount on the book from the Lofty Bookstore for the same amount as the original price of the book he got from Inkhorn Bookstore, how much is the difference between the two books' original prices?

suelve la siguiente ecuación: \[ 40+2,5 \bullet x=100 \] Luál es el valor de \( x \) ? \( \begin{array}{llll}56 & \text { B) } 40 & \text { C) } 24 & \text { D) } 16\end{array} \)

\( ( 15 x - 12 ) ^ { \circ } + 5 x - 18 = 180 \)

¿Cuál de las siguientes expresiones es igual a \( (2 x-3)^{2} ? \) A) \( 2 x^{2}-12 x+9 \) B) \( 4 x^{2}-6 x-9 \) C) \( 4 x^{2}-12 x+9 \) D) \( 4 x^{2}-9 \)