Answer:
x-30y=100 and 10y=x-20
Step-by-step explanation:
For this case we must find an expression to find 40% of 25. So, we make a rule of three:
25 -----------> 100%
x -------------> 40%
Where "x" represents the amount that determines 40% of 25.

40% of 25 is 10. And an expression to find it is:

Answer:

Answer:
12600
Step-by-step explanation:
5% of 12000 is 600 so just add them