📢 Too many exams? Don’t know which one suits you best? Book Your Free Expert 👉 call Now!

  • google app store apple app store
  • ✖

      Question

      The average of sixty numbers is 70 while the average of

      first thirty numbers and last thirty numbers is 75 and 85, respectively. Find the thirtieth term.
      A 600 Correct Answer Incorrect Answer
      B 520 Correct Answer Incorrect Answer
      C 640 Correct Answer Incorrect Answer
      D 785 Correct Answer Incorrect Answer

      Solution

      ATQ,

      Sum of sixty numbers = (60 × 70) = 4200

      Sum of the first thirty numbers = (30 × 75) = 2250

      Sum of the last thirty numbers = (30 × 85) = 2550

      So, thirtieth term = 2250 + 2550 - 4200 = 600

      Practice Next
      ask-question