half of the volume of petrol & kerosene mixture of ratio 7:5 is converted into mixture of ratio 3:1 by substitution method.while the mixture of ratio 7:5 was formed from the mixture of 7:3 by adding the kerosene in it.If the 240 litres petrol is required in replacement method .what is the total amount of kerosene was added to prepare the mixture of 7:5.
1. 100 litres. 2. 400 litres. 3. 50 litres
4. 200 litres.

question no. 51 plzz explain

ABC is an equilateral triangle .two circles of radius 4 and 12 cm are inscribed in triangle wt is the side ?

The income of Amala is 20% more than that of Bimala and 20% less than that of Kamala. If Kamala's income goes down by 4%
and Bimala's goes up by 10%, then the percentage by which Kamala's income would exceed Bimala's is nearest to

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at a college entrance examination, each candidate is admitted or rejected according to whether he has passed or failed the tests. of the candidate who are really capable , 80%passed the test and of the incapable 25% passed the test. Given that 40% candidate are really capable ,then the proportion of capable college students is about

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How many natural numbers less than 1000 are divisible by 5or 7 but not by 35?