Question

There are 80 pupils in a group. The only languages available for the group to study are Russian and Spanish. 50 pupils study Russian. 31 pupils study Spanish. 23 pupils study neither Russian nor Spanish. Find the probability to select a pupil that studies Spanish and Russian. Probability

Answer 1

33 out of 80 pupils

Explanation:

Total = 80 pupils

Studying Russian and Spanish = 80 - 23;

= 57 pupils

Out of 57 pupils, 50 pupils study Russian = 7 diff.

Out of 57 pupils 31 pupils study Spanish = 26 diff.

Answer 2

3/10

Explanation

The total number of people that are studying neither Russian nor Spanish will be subtracted from the total number of people

i.e 80-23=57

Now let's calculate those that studies both languages (x)

50+31-x=57

-x=57-50-31

-x=-24

x=24

probability of choosing those that studies both Spanish and Russian is

24/80=3/10