Number System
If the sum of five consecutive even numbers A, B, C, D and E is 130, what is the product of A and E ?

720
840
660
780

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Number System
In a two-digit number, if it is known that its unit's digit exceeds its ten's digit by 2 and that the product of the given number and the sum of its digits is equal to 144, then the number is:

24
26
42
46

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Number System
Letters of the word SERIES are arranged in such a way that all the vowels always come together. What is the total number of ways of making such an arrangement ?

98
72
36
112

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