evanwall91
08.07.2019 •
Mathematics
At a pet store, the ratio of cats to dogs is 7: 3, and the ratio of birds to dogs is 5: 6. if the pet store only has birds, cats, and dogs, then birds represent what percent of all animals at the store?
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Ответ:
7:3=14:6
5:6
total=14x+6x+5x=25x
5x/25xX100
20%
Ответ:
2x+y=7
Put, x=2
2(2)+y=7
4+y=7
y=−4+7
∴y=3.
I hope this helps