There were 38 purses. 23 had a black pen; 27 a blue pen; 21 a pencil. 15 both black and blue pen, 12 both black pen and a pencil, 18 both a blue pen and a pencil, and 10 had all three items. How many had eactly 2 of 3 writing instruments?
by 
LindaW
ANSWERS: 1
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10 had all three items. Throw those unhelpful purses out of the window. What is left? 28 purses. 13 with black pen 17 with blue pen 11 with pencil 5 with black and blue pen 2 with black pen and pencil 8 with blue pen and pencil 0 with all three. How many with exactly 2 of 3? 5+2+8 = 15
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