Hi,

In reply to Your TY: 45 people speak one or both of the languages...

15 must speak both, because there are only 30 people: 45-30 = 15

30 students in a class: 25 speak french and 20 speak english. 

each student speaks atleast 1 of these languages

P(both languages) = 15/30 = 1/2

P(french only) = 10/30 = 1/3

P(one language only) = 15/30 = 1/2



 

RELATED QUESTIONS

There are 25 students in a class. Of these, 14 speak Spanish, 12 speak French, 6 speak... (answered by Theo)

Each student in an international study group speaks English, Japanese, or Spanish. Of... (answered by zephyr,richwmiller)

Each student in an international study group speaks English, Japanese, or Spanish. Of... (answered by pcsp_kumat)

In a committee of 30 members, 20 speak English and 15 speak French. If 8 speak both... (answered by mananth)

At a scientific congress, 85% of participants speak english (A), 35% speak french (F) and  (answered by ikleyn)

Among 30 secretaries of several faculties in a university each of them speaks at least... (answered by richwmiller)

Suppose a math class contains 33 students, 19 females (three of whom speak French) and 14  (answered by Edwin McCravy)

Suppose a math class contains 27 students, 11 females (two of whom speak French) and 16... (answered by jorel555)

Suppose a math class contains 31 students, 10 females (six of whom speak French) and 21... (answered by Theo)