General Aptitude - 1

  • City A population is 68000, decreasing at a rate of 80 per year City B having population 42000 increasing at a rate of 120 per Year. In how many years both the cities will have same population ?
    Let this will take x years , now after x years both cities will have same population.
    so 68000-80x=42000+120x
    so 200x=26000
    so x=130 years
  • A person buy the 6, 1 Rs stamps and 7, 50 paisa stamps he has given 12 Rs how much money he will get back ?
    so 12-9.50=2.50 Rs he will get back
  • In a company 3/5 of people know shorthand 1/4th know typing and 1/5 know both. What fraction of people do not know both?
    let x be total employees now 3x/5 know typing and 1x/4 know short hand and 1x/5 know both so employees who know either typing or short hand will be:
    3x/5 +1x/4 -1x/5 =13x/20
    so those who don't know both are:
    x-13x/20 =7x/20
    so 7/20 employees don't know both.
  • There are 5 red shoes, 4 green shoes. If one draws randomly a shoe . What is the probability of getting red shoe ?
    probability of picking a shoe is 9c1 ie 9
    and probability of picking a red shoe is 5c1 ie 5
    so probability of picking a shoe and that is red will be 5/9
  • If the sum of five consecutive numbers is 35. Find how many prime numbers are there ?
    Nos are 5,6,7,8 and 9
    so prime nos are 5 and 7
  • If the length of the rectangle is reduced by 20% and breath is increased by 20 % what is the net change ?
    let l be length and b is breadth now area is lb
    new length is 0.8l and breadth is 1.2b so new area is 0.96lb
    so there will be a reduction in area by lb-0.96lb=0.04lb i.e. 4%



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