Question

Jenna buys 12 lb of meat. Some of the meat is chicken and costs $1.90/lb. The rest is beef, which costs $4.30/lb. She spends a total of $34.80.

Which equation models this situation?

Let c represent the number of pounds of chicken she buys.


A.
(1.9 + 4.3)(12 – c) = 34.8

B.
4.3c + 1.9(c + 14) = 34.8

C.
4.3c + 1.9(12) = 34.8

D.
1.9c + 4.3(12 − c) = 34.8

Answer 1

Any idea?

Answer 2

D. or A.

Answer 3

hint:
\(\large \begin{array}{rllll}
\textit{Jenna buys 12 lb of meat}\implies &b+c = 12
\\ \quad \\
\begin{array}{llll}
\textit{chicken is 1.90, and beef is 4.30}\\
\textit{She spends a total of 34.80}
\end{array}\implies &1.90c+4.30b=34.80
\end{array}\)

Answer 4

use substitution from the 1st equation, and plug it in the 2nd equation

Answer 5

So it is A. ?