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Consider a quantity of a radioactive substance. The fraction of this quantity that remains after t half-lives can be found by using the expression `3^(–t)`. (a) What fraction of substance remains after 7 half-lives? (b) After how many half-lives will the fraction be `1/243` of the

asked Jan 17, 2022 in 8th-maths by Arun (1.7k points)

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The diameter of the Sun is `1.4 xx 10^9` m and the diameter of the Earth is `1.2756 xx 10^7` m. Compare their diameters by

asked Jan 17, 2022 in 8th-maths by purvi (1.8k points)

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Simplify: `(1/5)^45 xx (1/5)^(-60) - (1/5)^+28 xx

asked Jan 17, 2022 in 8th-maths by krutika (1.7k points)

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If `7/3%` of a number is 42, then the number

asked Jan 17, 2022 in 8th-maths by sumit (1.6k points)

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Find the compound interest on Rs 48,000 for one year at 8% per annum when compounded half

asked Jan 17, 2022 in 8th-maths by Arun (1.7k points)

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Suppose a certain sum doubles in 2 years at r % rate of simple interest per annum or at R% rate of interest per annum compounded annually. We

asked Jan 17, 2022 in 8th-maths by purvi (1.8k points)

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To gain 25% after allowing a discount of 10%, the shopkeeper must mark the price of the article which costs him Rs 360

asked Jan 17, 2022 in 8th-maths by krutika (1.7k points)

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For calculation of interest compounded half yearly, keeping the principal same, which one of the following is

asked Jan 17, 2022 in 8th-maths by Simran (1.8k points)

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Avinash bought an electric iron for Rs 900 and sold it at a gain of 10%. He sold another electric iron at 5% loss which was bought Rs 1200. On the transaction he has

asked Jan 17, 2022 in 8th-maths by nishit (1.8k points)

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15% increase in price of an article, which is Rs 1,620, is the increase of Rs

asked Jan 17, 2022 in 8th-maths by uday (1.6k points)

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When principal P is compounded semi-annually at r % per annum for t years, then Amount =

asked Jan 17, 2022 in 8th-maths by nishit (1.8k points)

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The marked price of an article when it is sold for Rs 880 after a discount of 12% is

asked Jan 17, 2022 in 8th-maths by vaibhav (1.7k points)

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In the first year on an investment of Rs 6,00,000 the loss is 5% and in the second year the gain is 10%, the net result is

asked Jan 17, 2022 in 8th-maths by vaibhav (1.7k points)

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Additional expenses made after buying an article are included in the cost price and are known as Value Added

asked Jan 17, 2022 in 8th-maths by krutika (1.7k points)

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The compound interest on a sum of Rs P for T years at R% per annum compounded annually is given by the formula

asked Jan 17, 2022 in 8th-maths by nikhil (1.8k points)

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In case of loss, C.P. = `(100 xx S.P.)/(100 +

asked Jan 17, 2022 in 8th-maths by vaibhav (1.7k points)

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Sales tax is always calculated on the cost price of an item and is added to the value of the

asked Jan 17, 2022 in 8th-maths by Simran (1.8k points)

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Three bags contain 64.2 kg of sugar. The second bag contains `4/5` of the contents of the first and the third contains `42 1/2%` of what there is in the second bag. How much sugar is there in each

asked Jan 17, 2022 in 8th-maths by sumit (1.6k points)

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In the year 2001, the number of malaria patients admitted in the hospitals of a state was 4,375. Every year this number decreases by 8%. Find the number of patients in

asked Jan 17, 2022 in 8th-maths by vaibhav (1.7k points)

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In 1975, the consumption of water for human use was about 3850 cu.km/year. It increased to about 6000 cu.km/year in the year 2000. Find the per cent increase in the consumption of water from 1975 to 2000. Also, find the annual per cent increase in consumption (assuming water consumption increases

asked Jan 17, 2022 in 8th-maths by yogita (1.8k points)

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