Questions by nishit

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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 18, 2022 in 8th-maths

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The paper clip below has the indicated length. What is the length in standard form.

asked Jan 18, 2022 in 8th-maths

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

asked Jan 18, 2022 in 8th-maths

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Simplify: `((9) xx 27 xx t^4)/((3)^(-2) xx (3)^4 xx

asked Jan 18, 2022 in 8th-maths

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If the cost price of 10 shirts is equal to the selling price of 8 shirts, then which of the following is true for the

asked Jan 18, 2022 in 8th-maths

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Overhead charges, if any, are sometimes included in the cost

asked Jan 18, 2022 in 8th-maths

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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 18, 2022 in 8th-maths

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Shyama purchases a scooter costing Rs 36,450 and the rate of sales tax is 9%, then the total amount paid by her

asked Jan 18, 2022 in 8th-maths

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A sum is taken for two years at 16% p.a. If interest is compounded after every three months, the number of times for which interest is charged in 2 years

asked Jan 18, 2022 in 8th-maths

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

asked Jan 18, 2022 in 8th-maths

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2500 is greater than 500 by

asked Jan 18, 2022 in 8th-maths

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In a factory, women are 35% of all the workers, the rest of the workers being men. The number of men exceeds that of women by 252. Find the total number of workers in the

asked Jan 18, 2022 in 8th-maths

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Find the S.P. if (a) M.P. = Rs 5450 and discount = 5% (b) M.P. = Rs 1300 and discount =

asked Jan 18, 2022 in 8th-maths

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In Delhi University, in the year 2009 – 10, 49,000 seats were available for admission to various courses at graduation level. Out of these 28,200 seats were for the students of General Category while 7,400 seats were reserved for SC and 3,700 seats for ST. Find the per centage of seats available for

asked Jan 18, 2022 in 8th-maths

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Kritika ordered one pizza and one garlic bread from a pizza store and paid Rs 387 inclusive of taxes of Rs 43. Find the

asked Jan 18, 2022 in 8th-maths

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A shopkeeper was selling all his items at 25% discount. During the off season, he offered 30% discount over and above the existing discount. If Pragya bought a skirt which was marked for Rs 1,200, how much did she pay for

asked Jan 18, 2022 in 8th-maths

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Rahim borrowed Rs 10,24,000 from a bank for one year. If the bank charges interest of 5% per annum, compounded half-yearly, what amount will he have to pay after the given time period. Also, find the interest paid by

asked Jan 18, 2022 in 8th-maths

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Sita is practicing basket ball. She has managed to score 32 baskets in 35 attempts. What is her success rate in per centage?

asked Jan 18, 2022 in 8th-maths

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If 5 persons can finish a job in 10 days then one person will finish it in 2

asked Jan 18, 2022 in 8th-maths

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If two quantities p and q vary inversely with each other then ______ of their corresponding values remains

asked Jan 18, 2022 in 8th-maths

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