a) 15
b) 45
c) 60
d) None of these
Answer: d
Explanation: Let the numbers be x, y and z.
$$\eqalign{
& \left( {\frac{{x + y}}{2}} \right) – \left( {\frac{{y + z}}{2}} \right) = 15 \cr
& \left( {x + y} \right) – \left( {y + z} \right) = 30 \cr
& x – z = 30 \cr} $$
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