To find out how many tacos Peter can make using 1 pound of ground beef based on Jaqueline's recipe, we can first determine the number of tacos made per pound of ground beef.
Jaqueline used 2.5 pounds of ground beef to make 25 tacos. We can calculate the number of tacos per pound by dividing the total number of tacos by the total pounds used:
\[ \text{Tacos per pound} = \frac{25 \text{ tacos}}{2.5 \text{ pounds}} = 10 \text{ tacos per pound} \]
Now, if Peter uses 1 pound of ground beef, he can make:
\[ \text{Tacos Peter can make} = 10 \text{ tacos per pound} \times 1 \text{ pound} = 10 \text{ tacos} \]
Therefore, Peter will be able to make 10 tacos.