She will be able to make 7 raspberry tarts and 7 blueberry tarts.
To find out how many raspberry tarts Sydney can make, we need to take the total number of raspberries (28) and divide it by how many raspberries are needed per tart (4).
28 ÷ 4 = 7, which means she can make 7 raspberry tarts.
The same logic applies to the blueberry tarts, so we do the total (35) divided by how many we need for 1 tart (5):
35 ÷ 5 = 7, so she can make 7 blueberry tarts.