akurathi12 wrote:
In an examination, each student appeared for at least one of the two quizzes namely, Science Quiz and General Knowledge Quiz. If 70% of the students appeared for exactly one of the two quizzes and 50% appeared for Science quiz, what percentage of the students appeared only in the science quiz?
A. 10%
B. 20%
C. 30%
D. 40%
E. 50%
I do not know how to make venn diagrams here,
however let only science=s
and only GK=g
total=100
total=s+g-both s&g
Now,s+g=70 (as per question)
100=70-both s&g
==>both s&g=30
Now,out of 50 students who gave s, 30 also gave g
so only s=50-30=20
Ans:B
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59% (01:50) correct 
