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Total students attended on first afternoon= 115
S=75.....and T= 110
only F= 30
FS=35
FT=70
Total students= only F+ FS+FT-all three (FST)
115=30+35+70-FST
FST=135-115=20

Answer: B
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- Total on Day 1 = 115
Includes:
- Only Day 1 = 30
- First & Second = 35 → includes those who also came on all three → so 35 includes x
- First & Third = 70 → includes those who also came on all three → so 70 includes x
So:
30 (only Day 1) + (35 - x) + (70 - x) + x = 115
→ 30 + 35 - x + 70 - x + x = 115
→ 135 - x = 115
→ x = 20

Answer: B
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Venn diagram
a=30
d+e=35
f+e=70
a+d+f+e=115
solving gives e=20
Answer is B
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Given 115, 75 and 110 students attended on the first, second and third afternoons respectively. 30 attended only on the first day, 35 on the first and second days. 70 attended the first and the third days and 35 attended on the second and third days.

Total attended on the first day 115 = 30 +70+35- people attended on all three days
Hence people attended on all three days = 20 Option B
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