Question

A survey of 500 television viewers produced the following information,285 watch football,195 watch hockey,115 watch basketball,45 watch football and basketball,70 watch football and hockey,50 watch hockey and basketball and 50 do not watch any of the three games.
1)How many watch all the three games?
2)How many watch exactly one of the three games?

reply fast! tmr is my maths test.

Answer 1

285-(45+70)=170 PEOPLE WATCH ONLY FOOTBALL HERE 45+70 IS THE NO. OF PEOPLE WHO WATCH FOOTBALL AS WELL AS OTHER EVENTS.
195-(70+50)=75 PEOPLE WATCH ONLY HOCKEY . HERE 70+50 IS  AGAIN THE NO. OF PEOPLE WATCHING BOTH HOCKEY AND ANY OTHER EVENT.
115-(45+50)=20 PEOPLE WATCH ONLY BASKETBALL.

Answer 2

Answer:

Step-by-step explanation:

Let F denote people watch football.

H denotes people watch hockey.

B denotes people watch basketball.

Now,

|F|=285

|H|=195

|B|=115

|FՈH| =70

|FՈB| =45

|HՈB| =50

(|F U H U B|)'=50

|F Ո H Ո B| = |F U H U B|-|F|-|H|-|B|+| F Ո H |+| H Ո B |+|F Ո B| =20

Hence, 20 viewers watch all 3 kinds of games.

|F – H- B|=|F| - | F Ո H |-| F Ո B |+| F Ո H Ո B |=190

|H – B - F|=95

|B – F - H|=40

Hence, No of viewers who watch exactly one of the sports = 190+95+40 = 325

Plz mark this ans as brainliest plz