Number System
A number consists of 3 digit whose sum is 10. The middle digit is equal to the sum of the other two and the number will be increased by 99 if its digits are reversed. The number is:

253
370
352
145

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Number System
On a new year eve, every student of a class sends a card to every other student. If the total number of cards delivered is 1980, how many students are there in the class ?

43
47
45
41

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Number System
What is a two-digit number if the ratio of the digit at ten's place to the digit at unit's place is 4 : 3 ? (I) The sum of the digits of a two-digit number is 14. (II) The digit at unit place is 75% o

If the data even in both statements (I) and (II) together is not sufficient to answer the question.
If the data in statement (II) alone is sufficient to answer the question, while that in statement (I) alone is not sufficient.
If the data either in statement (I) alone or in statement (II) alone is sufficient to answer the question.
If the data in statement (I) alone is sufficient to answer the question while that in statement (II) alone is not sufficient.

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