Answer: OPTION C.
Explanation:
You know that the chocolate maker melts three blocks of chocolate that weight 5.4 ounces, 6.1 ounces, and 5.7 ounces; therefore, the total ounces of chocolate melted is:
![5.4\ ounces+6.1\ ounces+5.7\ ounces=17.2\ ounces](https://img.qammunity.org/2020/formulas/mathematics/middle-school/f20ul6fuaqfg1mhsj6e0i6ypox83e05nuy.png)
Let be "x" the number of truffles that he make with 17.2 ounces of chocolate.
Knowing that each truffle takes 0.4 ounces of chocolate, you can set up the following proportion:
![(0.4)/(1)=(17.2)/(x)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/ftebrflm7auk1tx5a9p8gbvlv9dalezn9x.png)
Finally, you must solve for "x":
![(x)((0.4)/(1))=17.2\\\\0.4x=17.2\\\\x=(17.2)/(0.4)\\\\x=43](https://img.qammunity.org/2020/formulas/mathematics/middle-school/94pdlsyxc8tv1thcbs4pbewpr4pj5v2kxm.png)