General Maths Puzzle Category

You have 100 rupees and you are supposed to buy some pens, pencils and erasers with it.A pen costs 10 rupee and eraser 50 paisa.You should buy atleast 100 things with the money.

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General Other Question

A person is standing along with his bike near to a milestone. A two digit number was on the milestone. He started driving the bike with constant speed for an hour then found an another milestone with a number on it which is opposite to the number of first milestone. He again travelled for an hour with the same constant speed then he found another milestone with a number which is same as the first milestone but with a zero in middle of that number.
Find the speed and numbers on the milestone.?? 1 rs=20 sparrow
1 rs=1 peacock
5 rs=1 crow
total rs =100,total count of birds =100
condition:must 3 birds should be selected?