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16) If 75% of the class answered the first question of the test correctly, 55% answered the second question correctly and 20% answered neither of the questions correctly, what % answered both correctly?
a) 10
b) 20
c) 50
d) 65
Read Solution (Total 2)
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- ans=(c) 50
let A & B be the % of student answered 1st & 2nd ques resp.
A(intersection)B = A + B - A(union)B
=75 + 55 -(100-20)
=130-80
=50% - 11 years agoHelpfull: Yes(2) No(0)
- 75+55-(100-20)=130-80=50
- 11 years agoHelpfull: Yes(1) No(0)
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