Others Maths Puzzle

main()
{
int a=4,b=2;
a=b2;
printf("%d", a);
}

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Others Other Question

a heavy tree trunk can be sawed into 12ft long piece in 1 min. how long will take it to saw into 12 equal pieces? In an office there are 75% skilled workers and remaining are Unskilled. 80% of skilled workers and 20% of unskilled workers are permanent. If number of temporary workers is 189, then what is the number of total workers?