Question

In a committee, 50 peoplr speak french 20 speak spanish and 10 speak both spanish and french. How many speak at least one of these two languages.​

Answer 1

Answer:

Number of people speaking both Spanish and French=10

Number of people speaking only French=50-10=40

Number of people speaking only Spanish=20-10=10

Hence

Number of people speaking at least one of these languages=40+10+10=60 (at least means one or more than one)

Hope it helps.....

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Answer 2

Answer:

let set A contain 50 people who speak french

nA=50

let set B contain 20 people who speak Spanish

nB=20

n(A intersacion B) =10

we know that

n(A union B)=nA +nB -n(A intersacion B)

n (A union B)=50+20 -10=70-10=60

number of people speak at least one of two language is 60