A box contains 20 electric bulbs, out of which 4 are defective. Two bulbs are chosen at random form this box. The probability that at least one of these is defective is ___

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From 6 boys and 4 girls, 5 are to be selected for admission for a particular course. In how many ways can this be done if there must be exactly 2 girls?

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The perimeter of a rectangle is 26 cm. The rectangle is converted to a square by tripling the width and taking a quarter of the length. what is the perimeter of the resulting square?

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If 3 apples cost 19 cents, how many apples can be purchased for $1.52?

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In an examination , 34% of the studens failed in mathematics and 42% failed in English. If 20% of the students failed in both the subjects , then find the percentage of students who passed in both the subjects .

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125 gallons of a mixture contains 20% water. what amount of additional water should be added such that water content is raised to 25%?

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