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  • Question
  • A series of books was published at seven years interval. When the seventh book was issued, the sum of the publication year was 13,524. When was the first book published?


  • Options
  • A. 1932
  • B. 1942
  • C. 1911
  • D. 1917

  • Correct Answer
  • 1911 

    Explanation

    Let us assume the first book published in year x.
    According to question,
    Books are published at seven years interval,
    First edition book published in year = x
    Second edition book published in year = x + 7
    Third edition book published in year = x + 14
    Four edition book published in year = x + 21
    Five edition book published in year = x + 28
    Six edition book published in year = x + 35
    Seven edition book published in year = x + 42
    When the seventh book was issued, the sum of the publication year was 13,524.
    x + x + 7 + x +14 + x +21 + x + 28 + x + 35 + x + 42 =13524
    147 + 7x = 13524
    7x = 13524 -147
    ? x = 13377/7 = 1911
    The first book published in year x = 1911


  • Linear Equation problems


    Search Results


    • 1. 
      There are two numbers such that the sum of twice the first number and thrice the second number is 100 and the sum of thrice the first number and twice the second number is 120. Which is the larger number?

    • Options
    • A. 32
    • B. 12
    • C. 14
    • D. 35
    • Discuss
    • 2. 
      If the number obtained on the interchanging the digits of two-digits number is 18 more than the original number and the sum of the digits is 8, then what is the original number?

    • Options
    • A. 50
    • B. 51
    • C. 35
    • D. 53
    • Discuss
    • 3. 
      A fraction becomes 7/8, if 5 is added to both the numerator and the denominator. If 3 is added to both the numerator and the denominator, it becomes 6/7. Find the fraction.

    • Options
    • A. 8/11
    • B. 9/11
    • C. 10/11
    • D. `Cannot be determine
    • Discuss
    • 4. 
      The ratio of incomes of two persons is 8 : 5 and the ratio of their expenditure i 2 : 1. If each of them manages to save ? 1000 per month, find the difference of their monthly income

    • Options
    • A. ? 2500
    • B. ? 1500
    • C. ? 1000
    • D. ? 700
    • Discuss
    • 5. 
      One says "Give me a hundred friend ! I shall then become twice as rich as you ". The other replies, "If you give me ten, I shall be six times as rich as you." Find the amount of their capitals.

    • Options
    • A. ? 40, ? 170
    • B. ? 60, ? 180
    • C. ? 80, ? 200
    • D. Cannot be determined
    • Discuss
    • 6. 
      The difference between a two- digit number and the number obtained by interchanging the position of its digits is 36.What is the difference between the two digits of that number?

    • Options
    • A. 3
    • B. 4
    • C. 9
    • D. Cannot be determined
    • Discuss
    • 7. 
      If the digits of a two-digit number are interchanged , the number formed is greater than the the original number by 45. If the difference between the digits is 5, then what is the original number?

    • Options
    • A. 16
    • B. 27
    • C. 38
    • D. can not be determined
    • Discuss
    • 8. 
      In a two-digit number, the digit in the unit's place is three times the digit in tenth's place. The sum of the digits is equal to 8. What is the number?

    • Options
    • A. 20
    • B. 26
    • C. 39
    • D. 13
    • Discuss
    • 9. 
      In a group of equal number of cows and herdsmen, the number of legs was 28 less than four times the number of heads . The number of herdsmen was

    • Options
    • A. 7
    • B. 28
    • C. 21
    • D. 14
    • Discuss
    • 10. 
      A number when subtracted by 1/7 of itself gives the same value as the sum of all the angles of a triangle. What is the number?

    • Options
    • A. 224
    • B. 210
    • C. 140
    • D. 350
    • Discuss


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