Number System
A laborer is engaged for 30 days on the condition that he receives Rs.25 for each day he works and is fined Rs.7.50 for each day is absent. He gets Rs.425 in all. For how many days was he absent?

8
9
10
6

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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
41
47
45

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