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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 18, 2022
in
8th-maths
marks1
chapter9
#tnf
0
votes
0
answers
In case of loss, C.P. = `(100 xx S.P.)/(100 +
asked
Jan 18, 2022
in
8th-maths
marks1
chapter9
#tnf
0
votes
0
answers
Arunima bought household items whose marked price and discount % is as follows: Item Quantity Rate Amount Discount% (a) Atta 1 packet 200 200 16% (b) Detergent 1 packet 371 371 22.10% (c) Namkeen 1 packet 153 153 18.30% Find the total amount of the bill she has to
asked
Jan 18, 2022
in
8th-maths
marks2
chapter9
#sub
0
votes
0
answers
Sunscreens block harmful ultraviolet (UV) rays produced by the sun. Each sunscreen has a Sun Protection Factor (SPF) that tells you how many minutes you can stay in the sun before you receive one minute of burning UV rays. For example, if you apply sunscreen with SPF 15, you get 1 minute of UV rays for every 15 minutes you stay in the sun. 1. A sunscreen with SPF 15 allows only `1/15` of the sun’s UV rays. What per cent of UV rays does the sunscreen abort? 2. Suppose a sunscreen allows 25% of the sun’s UV rays. a.
asked
Jan 18, 2022
in
8th-maths
marks4
chapter9
#sub
0
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0
answers
A student used the proportion `n/100 = 5/32`to find 5% of 32. What did the student do
asked
Jan 18, 2022
in
8th-maths
marks4
chapter9
#sub
0
votes
0
answers
A car covers a distance in 40 minutes with an average speed of 60 km per hour. The average speed to cover the same distance in 30 minutes
asked
Jan 18, 2022
in
8th-maths
marks1
chapter13
#mcq
0
votes
0
answers
If the distance travelled by a rickshaw in one hour is 10 km, then the distance travelled by the same rickshaw with the same speed in one minute
asked
Jan 18, 2022
in
8th-maths
marks1
chapter13
#mcq
0
votes
0
answers
If 12 pumps can empty a reservoir in 20 hours, then time required by 45 such pumps to empty the same reservoir is ______
asked
Jan 18, 2022
in
8th-maths
marks1
chapter13
#fib
0
votes
0
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An auto rickshaw takes 3 hours to cover a distance of 36 km. If its speed is increased by 4 km/h, the time taken by it to cover the same distance is
asked
Jan 18, 2022
in
8th-maths
marks1
chapter13
#fib
0
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0
answers
When the distance is kept fixed, speed and time vary directly with each
asked
Jan 18, 2022
in
8th-maths
marks1
chapter13
#tnf
0
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0
answers
When two quantities are related in such a manner that if one increases and the other decreases, then they always vary
asked
Jan 18, 2022
in
8th-maths
marks1
chapter13
#tnf
0
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0
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The number of workers and the time to complete a job is a case of direct
asked
Jan 18, 2022
in
8th-maths
marks1
chapter13
#tnf
0
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0
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(i) The quantity of rice and its cost. (ii) The height of a tree and the number of years. (iii) Increase in cost and number of shirts that can be purchased if the budget remains the same. (iv) Area of land and its cost. (v) Sales Tax and the amount of the
asked
Jan 18, 2022
in
8th-maths
marks2
chapter13
#sub
0
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0
answers
The mass of an aluminium rod varies directly with its length. If a 16 cm long rod has a mass of 192 g, find the length of the rod whose mass is 105
asked
Jan 18, 2022
in
8th-maths
marks2
chapter13
#sub
0
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0
answers
If Naresh walks 250 steps to cover a distance of 200 metres, find the distance travelled in 350
asked
Jan 18, 2022
in
8th-maths
marks2
chapter13
#sub
0
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0
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If a and b vary inversely to each other, then find the values of p, q, r ; x, y, z and l, m, n. a l 9 n 6 b 5 m 25 10
asked
Jan 18, 2022
in
8th-maths
marks2
chapter13
#sub
0
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0
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If 25 metres of cloth costs Rs 337.50, then (i) What will be the cost of 40 metres of the same type of cloth? (ii) What will be the length of the cloth bought for Rs
asked
Jan 18, 2022
in
8th-maths
marks2
chapter13
#sub
0
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0
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A swimming pool can be filled in 4 hours by 8 pumps of the same type. How many such pumps are required if the pool is to be filled in `2 2/3`
asked
Jan 18, 2022
in
8th-maths
marks2
chapter13
#sub
0
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0
answers
44 cows can graze a field in 9 days. How many less/more cows will graze the same field in 12
asked
Jan 18, 2022
in
8th-maths
marks3
chapter13
#sub
0
votes
0
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Here is a key board of a harmonium: (a) Find the ratio of white keys to black keys on the keyboard. (b) What is the ratio of black keys to all keys on the given keyboard. (c) This pattern of keys is repeated on larger keyboard. How many black keys would you expect to find on a keyboard with 14 such
asked
Jan 18, 2022
in
8th-maths
marks3
chapter13
#sub
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