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?

Number System
If the letters of the word PREVIOUS be arranged at random, what is the probability that all the vowels come together ?

1/16
1/10
1/14
1/12

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