Karen spends 450 on monthly bills. of this total amount, 12% is for phone service, 1/10 is internet service, 2/9 is for utilities. id the rest of the amount is for food, how much does Karen have for

The complete question is:

how much does Karen have for food?

For this case, we have that the full amount of money is:

12/100 + 1/10 + 2/9 + x = 1

Where,

x: fraction of money for food

Clearing x we have:

x = 1 - (12/100 + 1/10 + 2/9)

Rewriting:

x = 251/450

Thus, the amount of money for food is:

450 * x = 450 * (251/450) = 251

Answer:

Karen has for food а bout:

$ 251