A

Admin • 828.70K Points
Coach

Q. Out of four numbers, the average of the first three is 18 and that of the last three is 16. If the last number is 19, the first is

  • (A) 19
  • (B) 18
  • (C) 20
  • (D) 25
  • Correct Answer - Option(D)
  • Views: 8
  • Filed under category Math
  • Hashtags:
Explanation by: Admin
Here , Sum of first three = 18 × 3
⇒ a + b + c = 54
and Sum of last three = 16 × 3
⇒ b + c + d = 48
last number = 19
∴ a + b + c – b – c – d
⇒ 54 – 48 = 6
⇒ a – d = 6
⇒ a – 19 = 6
⇒ a = 19 + 6 = 25

You must be Logged in to update hint/solution

Discusssion

Login to discuss.

Be the first to start discuss.