Book Maths Puzzle Numerical Ability

The cost of erecting a fence round a square field of area 10 hectares at 35 paise per meter.

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Book Other Question

How can you convey a message which says EMPTY or NOTHING using 6 match sticks???????
The average of 12 results is 15, and the average of the first two is 14. what is the average of the rest?

(a) 14 1/5 (b)15 (c) 15 1/5 (d) 14