a) 20
b) 25
c) 5
d) 30
Answer: b
Explanation: Numbers are
x > y > z > p > q > r
Average of first five numbers = 30
Sum of first five numbers
= a + y + z + p + q
= 5 × 30
= 150…..(i)
Average of last five numbers
= y + z + p + q + r
= 5 × 25
= 125…..(ii)
By equation (i) and (ii)
a – r = 150 – 125 = 25
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