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leva [86]
3 years ago
6

Help me pls u need it

Mathematics
1 answer:
marishachu [46]3 years ago
7 0
Call the number of blue jays b and the number of robins r

We are told there are twice as may robins as blue jays:
r=2b
and, there are 21 birds in total:
r+b=21
thus, by substitution:
2b+b=21
combine like terms:
3b=21
solve for b:
b=7
back substitute:
r=2(7)
r=14

There are 7 blue jays and 14 robins.
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