There is 31 students in a class. From mathematics was'nt worse mark than 2. Average mark in mathematics was 2.

How many students have mark 1 and how many mark 2?

Correct result:

n(1) =  0
n(2) =  31


(1a+2b)/31=2 a+b=31  a+2b=62 a+b=31 a=n(1)=0

(1•a+2•b)/31 = 2

a+2b = 62
a+b = 31

a = 0
b = 31

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