SSC Government Jobs Exams Numerical Ability Averages

The sum of three consecutive numbers is 87.
The middle number is

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SSC Other Question

The average age of eleven players of a cricket team decreases by 2 months when two new players are included in the team replacing two players of ages 17 years and 20 years. The average age of new players is If A : B = 3 : 4, B : C = 5 : 7 and C : D = 8 : 9 then
A: D is equal to