Use proportions to find the values that must be in the blanks.
For the first blank, 2 is to 5 as the value is to 10:

The first blank must be filled with 4.
For the second blank, 2 is to 5 as 6 is to the value:

The second blank must be filled with 15.
For the last blank, 2 is to 5 as the value is to 25:

The last blank must be filled with 10