In a group of pupils 35% study math,75% chemistry and 4 pupils study both math and chemistry .Each of the pupils studies at least one of these 2 subjects....How many pupils study only math?

Question

angela210793 · Answer

r there only 10 ppl tht study math?

angela210793 · Answer

hmmm i did it like this...let me write it...

angela210793 · Answer

hmm 35+75=110%..so 10%of X=4--->x=40

angela210793 · Answer

$$40=n(M \cup K)$$

anonymous · Answer

10 % study both...
=> 25 % study math only

angela210793 · Answer

hmmm....no....i can't find the symbol here....let me use word...and i'll attach it :)

angela210793 · Answer

attachment

anonymous · Answer

n(M)=0.35s
n(C)=0.75s
n(MUC)=s
n(M and C)=4
using the addition law we get s= 40
hence n(M) = 0.35*40 = 14

angela210793 · Answer

yea tht's right but u have to find the no. of ppl who study ONLY math..so n(M/C)=14-4=10

angela210793 · Answer

So i am right :) thnx :):)

anonymous · Answer

ohh. yeah . thts right.
srry i didn't read the question correctly.

angela210793 · Answer

^_^ Thnx :)