Number System
A canteen requires 17 dozen of eggs per week. How many eggs will it require from January 1 to February 11 ?

820
1224
525
987

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Number System
The difference between a two-digit number and the number obtained after interchanging its two digits is 36. The sum of the two digits of the number is 12. Find the lowest such possible number.

49
50
47
48

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Number System
A box contains 5 red, 4 black and 4 blue balls. If 3 balls are drawn randomly from the box, what is the probability that there are exactly 2 blue balls in the three drawn balls ?

27/143
29/145
30/146
28/144

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