Question

During a hike, Vijay saw a total of 19 birds and butterflies. Knowing that birds have 2 wings and butterflies have 4 wings, he counted 52 wings. Use a model to determine how many birds he saw.

9

10

11

12

Answer 1

12

Answer 2

a = birds
b = butterflys

a+b=19
2a+4b=52
so
a=19-b
2(a)+4b=52
2(19-b)+4b=52
38-2b+4b=52
2b=14
b=7
so a = 12

Answer 3

Thanks