Mr. Newton wears science-themed ties to school. In all, he has 34 ties with scientific designs. Of all the ties in

Mr. Newton wears science-themed ties to school. In all, he has 34 ties with
scientific designs. Of all the ties in his collection, b are bow ties and 21 are
straight ties
Which diagram models the story?
34
b
21
b
34
21
Which equation models the story?
b + 21 – 34
b – 21 = 34

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