Number System
The sum of the two numbers is 12 and their product is 35. What is the sum of the reciprocals of these numbers?

12/35
7/32
1/35
35/8

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Number System
In a five-litre mixture of milk and water the portion of water is 30%. How much milk should be added to the mixture so that the portion of water reduces to 5% ?

29 litre
21 litre
25 litre
17 litre

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Number System
A bag contains four red, six black and seven green balls. Three balls are drawn randomly. What is the probability that the balls drawn contain exactly two red balls ?

51/340
39/340
58/340
45/340

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