Maths olympiad Exam undefined

On a 26 question test, 5 points were deducted for each wrong answers and 8 points were added for right
answers. If all the questions were answered, How many were correct if the score was zero.

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Maths olympiad Other Question

There are 2 regular hexagonal pieces of cloth. From 1st piece a circular piece touching all the edges is cut. The second piece is divided into 6 equilateral traingles and then circular piece touching all 3 sides are cut from each triangle. If r is the ratio of scrap generated in 1st cloth to that of 2nd cloth..find 100r......use root 3 =1.7 and pie =3.1
A man bought a certain number of chairs for Rs.10000. He kept one for his own use and sold the rest at the rate Rs.50 more than he gave for one chair. Besides getting his own chair for nothing, he made a profit of Rs.450. How many chairs did he buy?