Last week, Wingspan Nature Center had a build-a-birdhouse event. At the event, people built 20 birdhouses for robins, 13 birdhouses for owls, and 41 birdhouses for bluebirds.
Which diagram can be used to find the total number of birdhouses people built during the event?
b
,41
20
13
b
b
20
13
41
How many birdhouses did people build during the event?
birdhouses
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