Answer:
set mary is x years old, and helen is y years old.
first sentence:x=2y
second one:4(y-8)=x+4
bring x=2y in 4(y-8)=x+4
=>4y-32=2y+4
=>2y=36
=>y=18
=>x=36
mary:36
helen:18
The average indoor cat should have 20 calories per pound to maintain weight. The average outdoor only cat should have 35 calories per pound to maintain weight. Indoor/outdoor cats are somewhere in between. o If your indoor cat weighs 10 pounds, then they should be eating approximately 200 calories per day.
