Answer: 4

Step-by-step explanation:

Let's donate the number or Php50 bills as x,

then the number of Php 100 bills is x.

As there are 10 bills at all,

then the number of Php200 bills is 10 − x − x = 10 − 2x

In this case, we can write the equation

50x + 100x + 200(10 − 2x) = 1250

150x + 200 x 10 − 200 x 2x = 1250

150x − 400x + 2000 = 1250

−250x = 1250 − 2000

−250x = −750

x = −750/ −250

x = 3

Then, there was

3 Php50 bills

3 Php100 bills

and 10 − 3 x 2 = 4 Php200 bills

Answer: 4