Given:
Incomes of A, B, C are in the ratio of 12: 9: 7
Spending of A, B, C are in the ratio of 15: 9: 8
A saves 25% of his income.

To find:
The ratio of the savings of A, B, and C.

Solution:
Let's assume the incomes of A, B, and C as 12x, 9x, and 7x respectively.
And let's assume the spending of A, B, and C as 15y, 9y, and 8y respectively.

A saves 25% of his income, so the savings of A can be calculated as:
Savings of A = 25% of Income of A
= (25/100) * 12x
= 3x

Now, let's calculate the savings of B and C:
Given that the income of B is 9x and the spending of B is 9y.
The savings of B can be calculated as:
Savings of B = Income of B - Spending of B
= 9x - 9y
= 9(x - y)

Similarly, the savings of C can be calculated as:
Savings of C = Income of C - Spending of C
= 7x - 8y

Now, let's find the ratio of the savings of A, B, and C:
Ratio of the savings of A, B, and C = Savings of A : Savings of B : Savings of C
= 3x : 9(x - y) : 7x - 8y
= 3x : 9x - 9y : 7x - 8y

Simplifying the ratio:
We can multiply each term in the ratio by a common factor of 1/x to simplify it further.

Ratio of the savings of A, B, and C = 3x : 9x - 9y : 7x - 8y
= 3 : 9 - 9(y/x) : 7 - 8(y/x)
= 3 : 9 - 9(15/12) : 7 - 8(15/12)
= 3 : 9 - 9(5/4) : 7 - 8(5/4)
= 3 : 9 - 45/4 : 7 - 40/4
= 3 : (9 - 45/4) : (7 - 40/4)
= 3 : (36/4 - 45/4) : (28/4 - 40/4)
= 3 : (-9/4) : (-12/4)
= 3 : (-9/4) : (-3)

Since the ratio cannot have negative values, we can multiply each term in the ratio by -1 to make it positive without changing the ratio.

Ratio of the savings of A, B, and C = 3 : (-9/4) : (-3)
= 3 : (9/4) : 3
= 12 : 9 : 16

Therefore, the ratio of the savings of A, B, and C is 12: 9: