ExpertsGlobal5
In a class of 100 students, 70 play basketball. How many students in the class play volleyball but not basketball?
(1) 60 students in the class do not play volleyball.
(2) The number of students playing both basketball and volleyball is twice the number of students playing neither.
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Let us use the following letters to denote the two set Venn diagram.
Let a denote the set containing Basketball only.
Let c denote the set containing Volleyball only.
Let b denote the set containing both volley ball and basket ball.
Let d denote the neither of the sets.
Given that: Volleyball = a+b = 70
c = ?
Statement 1:
60 students in the class do not play volleyball.
So, a+d = 60
we cannot find C.
Hence,
Insufficient. Statement 2:
The number of students playing both basketball and volleyball is twice the number of students playing neither.
b = 2*d
a + b+ c + d =100
a+ c + 3d = 100
Hence,
Insufficient.
combining both statements 1 and 2, we get
a+ b = 70 = a+ 2d
a+d = 60
solving we get d = 10, then a= 50, b=20
thus c=20
Hence,
Sufficient . Option C