Quant Boosters  Hemant Yadav  Set 3

P might be 12...
As 12 has 6 factors ..which gives 3 pairs of neg and pairs of positive

Could someone give its answer

@zabeer sir...
For 20a+k/200
Many more than 10 might be there.....As k varies from 019...and so does k....??????

This post is deleted!

Let students be x
(X/2)1 /x >=0.47 ( for x even)
(X/2 0.5)/x >=0.47 (x being odd case)It satisfies at x=17( min)