(killer) Hardest math test!!!

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This is a collection of hardest math questions!
I doubt you can get 100% :P

  1. 1

    5 workers recive 4500$ a year.How much money do 3 workers recive a year?

  2. 2

    If a bus moves 60 kmph it will have 3 hours delay. if it moves 90 kmph it will arrive 1 hour earlier. how many kilometers is this route?

  3. 3

    We have b=1 and a=-1.find the answer: (a+b-1)(b-a-1)(a-b+1)(a+b+1)=?

  4. 4

    We have 9 grams of acid with density of 50%.how much water do we need to add to it that density comes down to 30%?

  5. 5

    We have X cows. we get 1320 liters of milk from them in X+1 days. If we get 10 liters of milk from one cow a day we will have:

  6. 6

    If 3 hens lay 3 eggs in 3 days, how many eggs does one hen lay in 3 days?

  7. 7

    We need one hour to cut a metal pipe in 4 equal pieces. now we need to cut another pipe like the first one in 8 equal pieces. how much time do we need to do that?

  8. 8

    3 workers can build something in 62 days. after 10 days of working one worker will be added to them. how many days does it take for them to finish the job?

  9. 9

    Someone buys 3 chocolates for 40$ and sells 5 chocolates for 80$.how many chocolates does he have to sell to have a profit of 200$?

  10. 10

    12 painters can paint a building in 20 days. half of the work is over and the 3 painters are now added. how many days does it take for them to finish the rest of the work?

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