At the college entrance exam, a candidate is admitted according to whether he ha

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Practice Percentage – At the college entrance exam, a candidate is admitted according to whether he has passed or failed the test. Of the candidates who are really capable, 80 % pass the test and of the incapable, 25 % pass the test. Given that 40 % of the candidates are really capable, then the proportion of the really capable students who can pass the test to the total students who can pass is about:

The ratio between the number of passengers travelling by I & II Class between tw

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Practice Percentage – The ratio between the number of passengers travelling by I & II Class between two railway stations is 1 : 50, whereas the ratio of the I & II Class fares between the same stations is 3 : 1. If on a particular day, Rs. 1325 were collected from the passengers travelling between these stations, what was the amount collected from the II Class passengers ?

A sum of money was invested in scheme A for 12 years, which offers simple intere

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Practice Percentage – A sum of money was invested in scheme A for 12 years, which offers simple interest at a rate of 9% p.a. The amount received from scheme A was then invested for 2 years in scheme B which offers compound interest ( compounded annually ? at a rate of 10% p.a. If the interest received from scheme B was Rs 873.6, what was the sum invested in scheme A ?