Question

One third of the total number of students in a class are in Chemistry laboratory, 16
are in Physics laboratory and 12 are in Mathematics lab. How many students are
there in the class?

Answer 1

Answer:

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Step-by-step explanation:

R.E.F image

(i) 11−5−4+3=5

(3 removed twice)

(ii) 4−3=1

(iii) only maths =15−9−5+3

=4

only phy =12−9−4+3=2

only chem =5⇒Total=11

(iv) Atleast one =11+9+5+4−2(3)

=29−6=23

⇒ None =25−23=2