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
 
 Karen has for food about:
 $ 251

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