Jones like to watch the bird in her yard one morning she notices that there were twice as many robins as Blue Jays. if she count
ed 21 Blue Jays and Robbins in all how many blue jays did she count?
2 answers:
R=number of robbins
b=number of blue jays
twice as many robins as blue jays
r=2b
21 blue jays and robbins
r+b=21
subsitute
r=2b so subsitute 2b for r
2b+b=21
3b=21
divide both sides by 3
b=7
she counted 7 blue jays
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