Permutation Puzzle

How high do you have to count before you use the letter “a” in the English spelling of the whole number?
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If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?
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There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?
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There is a box. The area of its top is 240 square units, the area of the front is 300 square units and the area of the end is 180 square units.
Can you calculate the dimensions of this box with the given data?
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Can you think of any threedimensional shape that comprises exactly two surfaces?
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Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.
(You can use one number only once)
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The sum of a mother, her baby and her dog’s weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?
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A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.
Can you find out the percentage of those students who passed the first test and also passed the second test?
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I am a prime number.
The double of myself is equal to the square of me.which number am I?
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