Final answer:
Valentina will pay $6 if she needs to buy 25 more beads.
Step-by-step explanation:
To find out how much Valentina will pay for the additional 25 beads, we can set up a proportion using the given information. If she purchased 200 beads for $48, then the cost per bead is $48/200 = $0.24.
Using this information, we can find out how much she will pay for the 25 additional beads. The cost of 25 beads is 25 x $0.24 = $6.
Therefore, Valentina will pay $6 if she needs to buy 25 more beads.