1)There are two alloys made up of copper and aluminium . in the first alloy copper is half of the aluminium and in the second alloy copper is thrice as much as aluminium . how many times the second alloy must be mixed with first alloy to get the new alloy in which copper is twice as that of aluminium ?

2)The cost of setting up a magazine is Rs . 2800 . the cost of paper and ink etc is Rs. 80 per 100copies and printing cost is Rs. 160 per 100 copies . in the last month 2000copies were printed but only 1500 copies could be sold at Rs. 5 each . total 25% profit on the sale price was realized . there is one more resource of income from the magazine which is advertising . what some of money was obtained from advertising in magazine ?

3) Bhanu , Vibhu , Manu are three friends with different productivity . Bhanu working alone needs as much time as vibhu and manu working together , while vibhu himself needs 8 hours more working alone than when he works with manu . bhanu working alone needs 8 hours less than vibhu needs working alone . in how much time bhanu vibhu and manu together can complete the job ?

4) Rajeev and sanjeev are too close friends Rajeev's watch gains 1 minute in an hour and sanjeev watch loses 2 minutes in an hour . once thay set both the watches at 12:00 noon , with my correct watch . when will the two incorrect watches of rajeev and sanjeev show the same time together ?

5)Pipe A can fill an empty tank in 30hours while B can fill it in 45 hours . Pipe A and B are opened and closed alternatively , first pipe A is opened , then B again A and then B and so on for 1 hour time without any time laps . in how many hours the tank will be filled when it was empty , initially ?

6) 1 , 8, 18, 41, 67, ?

7) 0, 1, 12, 14, ?

8) 5.6, 7.1, 9.6, 13.1 ?