Answer:
A) $3
B) $20
Explanation:
First, find the cost of the pizza slice.
If she gave the lunch lady $10 and received $7 back, the pizza slice was $3.
This cost would give her $7 from the $10 that she paid.
Now, find how much money Susie needs.
Since each pizza slice is $3, we can find how much money the pizza will cost by multiplying 5 by 3:
5(3)
= 15
Add 5 to this, since the soda is $5
15 + 5
= 20
So, Susie will need $20