RRB NTPC Prelims Model Paper 4 with solutions

Question : 68 of 100

Marks: +1, -0

Average age of P and Q is 42 years and average age of R and S is 52 years. What is the average of ages of P, Q, R and S?

Solution:

(4) Sum of ages of P and Q = 42 ×2 = 84 years.
Sum of ages of R and S = 52 × 2 =104 years.
So, average of ages of P, Q, R and S

= {84+ 104}/4=47

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