Number System
The difference between two integers is 5. Their product is 500. Find the numbers.

21, 26
15, 20
20, 25
30, 25

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Number System
In how many different ways can be the letters of the word PENCIL be arranged among themselves ?

640
720
510
860

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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 ?

47
41
43
45

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