Brain Teasers & Puzzles

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Christina makes tasty toast in a small pan. After toasting one side of a slice, she turns it over. Each side takes 30 seconds. The pan can only hold two slices.
How can she toast both sides of three slices in 1 & 1/2 instead of 2 minutes?View SolutionSubmit Solution 5.9K views
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There is one fourdigit whole number n, such that the last four digits of n2 are the original number n
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In a school, 280 students studied chemistry, 254 students studied physics and 280 students studied biology.
97 students studied chemistry as well as physics, 138 students studied physics as well as biology and 152 students studied chemistry as well as biology.
73 students studied all the three branches.
Can you find out the total number of students?
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You throw me out when you want to use me and you take me in when you don\’t want to use me.
Who Am I?
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