It is given that the satellites serving either B, C or S do not serve O.
From (1), let the number of satellites serving B, C and S be 2K, K, K respectively.
Let the number of satellites exclusively serving B be x.
From (3), the number of satellites exclusively serving C and exclusively serving S will each be 0.3x
From (4), the number of satellites serving
O is same as the number of satellites serving only
C and
S. Let that number be
y.
Since the number of satellites serving
C is same as the number of satellites serving
S, we can say that
(number of satellites serving only
B and
C)+0.3x+100+y=( number of satellites serving only
B and
S)+ 0.3x+100+y Let the number of satellites serving only
B and
C= the number of satellites serving only
B and
S =Z Therefore, the venn diagram will be as follows
Given that there are a total of 1600 satellites
⇒x+z+0.3x+z+100+y+0.3x+y=1600
1.6x+2y+2z=1500............(1)
Also
K=0.3x+z+y+100 Satellites serving
B=2K=x+2z+100 ⇒2(0.3x+z+y+100)=x+2z+100
0.4x=2y+100 x=5y+250....(2)
Substituting ( 2 ) in (1), we will get
1.6(5y+250)+2y+2z=1500 10y+2z=1100 Z=550−5y..........(3)
The number of satellites serving at least two of
B,C or
S= number of satellites serving exactly two of
B,C or
S+ Number of satellites serving all the three
=z+z+y+100 =2(550−5y)+y+100 =1200−9y Given that this is equal to 1200
1200−9y=1200 ⇒y=0 If
y=0,x=5y+250=250 z=550−5y=550 No. of satellites serving
C=k=z+0.3x+100+y =550+0.3×250+100+y =725 No. of satellites serving
B=2k=2×725=1450. From the given options, we can say that the option "the number of satellites serving
C cannot be uniquely determined" must be FALSE