SSC Government Jobs Exams Numerical Ability Profit and Loss

A man sells an article at a profit of 25%. If he had bought it at 20% less and sold it for Rs. 10.50 less, he would have gained 30%. Find the CP of the article.

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SSC Other Question

a man is sitting in 180 m long train and count 21 poles in 40 secs which are 50m apart. fond the speed of train. if x=√3/2
find

(1 +x)/(1+√(1+x)) + (1 -x)/(1-√(1-x))