Questions by sumit

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About 230 billion litres of water flows through a river each day. How many litres of water flows through that river in a week? How many litres of water flows through the river in an year? Write your answer in standard

asked Jan 17, 2022 in 8th-maths

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For the following repeater machines, how many times the base machine is applied and how much the total stretch is?

asked Jan 17, 2022 in 8th-maths

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Find three repeater machines that will do the same work as a `(xx64)` machine. Draw them, or describe them using

asked Jan 17, 2022 in 8th-maths

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Find a single machine that will do the same job as the given hook-up. (a) a`(xx 2^3)` machine followed by `(xx 2^(–2))` machine. (b) a`(xx 2^4)` machine followed by `(xx(1/2)^2)` machine (c) a`(xx 5^99)` machine followed by a `(5^(–100))`

asked Jan 17, 2022 in 8th-maths

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By what number should `(–15)^(–1)` be divided so that the quotient may be equal to

asked Jan 17, 2022 in 8th-maths

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Simplify: `(1/2)^2-(1/4)^(3-1) =

asked Jan 17, 2022 in 8th-maths

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Arnav buys a book costing Rs 600. If the rate of sales tax is 7%, then the total amount payable by him is Rs

asked Jan 17, 2022 in 8th-maths

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Suppose for the principal P, rate R% and time T, the simple interest is S and compound interest is C. Consider the

asked Jan 17, 2022 in 8th-maths

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A jacket was sold for Rs 1,120 after allowing a discount of 20%. The marked price of the jacket

asked Jan 17, 2022 in 8th-maths

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The loss per cent on selling 140 geometry boxes at the loss of S.P. of 10 geometry boxes is equal to

asked Jan 17, 2022 in 8th-maths

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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

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The cost of a sewing machine is Rs 7,000. Its value depreciates at 8% p.a. Then the value of the machine after 2 years is Rs

asked Jan 17, 2022 in 8th-maths

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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

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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

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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

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Harshna gave her car for service at service station on 27-05-2009 and was charged as follows: (a) 3.10 litres engine oil @ Rs 178.75 per litre and VAT @ 20%. (b) Rs 1,105.12 for all other services and VAT @ 12.5%. (c) Rs 2,095.80 as labour charges and service tax @10%. (d) 3% cess on service Tax. Find the bill

asked Jan 17, 2022 in 8th-maths

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Devangi’s phone subscription charges for the period 17-02-09 to 16-03-09 were as follows : Period Amount (in Rs) Service Tax % 17-02-09 to 23-02-09 199.75 12 24-02-09 to 16-03-09 599.25 10 Find the final bill amount if 3% education cess was also charged on service

asked Jan 17, 2022 in 8th-maths

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If principal = Rs 1,00,000. rate of interest = 10% compounded half yearly. Find Interest for 6

asked Jan 17, 2022 in 8th-maths

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Babita bought 160 kg of mangoes at Rs 48 per kg. She sold 70% of the mangoes at Rs 70 per kg and the remaining mangoes at Rs 40 per kg. Find Babita’s gain or loss per cent on the whole

asked Jan 17, 2022 in 8th-maths

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A lady buys some pencils for Rs 3 and an equal number for Rs 6. She sells them for Rs 7. Find her gain or

asked Jan 17, 2022 in 8th-maths

Questions by sumit

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