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  • 0. A three digit number consists of 9,5 and one more number . When these digits are reversed and then subtracted from the original number the answer yielded will be consisting of the same digits arranged yet in a different order. What is the other digit?

    Ans: Let the digit unknown be n.

    The given number is then 900+50+n=950+n.



    When reversed the new number is 100n+50+9=59+100n.

    Subtracting these two numbers we get 891-99n.

    The digit can be arranged in 3 ways or 6 ways.

    We have already investigated 2 of these ways.

    We can now try one of the remaining 4 ways. One of these is n 95

    100n+90+5=891-99n

    or 199n =796

    so, n=4

    the unknown digit is 4.


  • 1. A farmer built a fence around his 17 cows,in a square shaped region.He used 27 fence poles on each side of the square. How many poles did he need altogether???

    Ans: 104 poles
    Here 25 poles Must be there on each side .And around four corners 4 poles will be

    present. 4*25+4=100+4=104 poles


  • 2. On the first test of the semester, kiran scored a 60. On the last test of the semester, kiran scored

    75%

    By what percent did kiran's score improve?

    Ans: 25%



    Sol. In first test kiran got 60

    In last test he got 75.

    % increase in test ( 60(x+100))/100=75

    0.6X+60=75

    0.6X=15

    X=15/0.6=25%


  • 3. group consists of equal number of men and women. Of them 10% of men and 45% of women are unemployed. If a person is randomly selected from the group. Find the probability for the selected person to be an employee.

    Ans: 29/40

    Sol: Assume men=100,women=100 then employed men & women r (100-10)+(100-45)=145
    So probability for the selected person to be an employee=145/200=29/40
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