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CBSE Class 8 Answered

How much pure alcohol be added to 400 ml of a 15 percent solution to make its strength 32 percent
Asked by ajayrath7 | 03 Dec, 2017, 07:22: AM
answered-by-expert Expert Answer
begin mathsize 16px style Quantity space of space alcohol space in space 400 space ml space solution equals 15 over 100 cross times 400 equals 60 space ml Let space straight x space ml space of space alcohol space be space added. Then comma space we space have fraction numerator 60 plus straight x over denominator 400 plus straight x end fraction equals 32 over 100 rightwards double arrow 6000 plus 100 straight x equals 12800 plus 32 straight x rightwards double arrow 68 straight x equals 6800 rightwards double arrow straight x equals 100 space ml end style
Answered by Rashmi Khot | 03 Dec, 2017, 01:11: PM

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CBSE 8 - Maths
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CBSE 8 - Maths
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CBSE 8 - Maths
0.3x-5/1.5x+11=-3/5 in this equation find the value of x and then check it .
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CBSE 8 - Maths
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CBSE 8 - Maths
a boat goes downstream and cover the distance between two ports in 5 hours while it covers the same distance upstream in 5-1/2 hours. find the speed of boat in still water if t he speed of stream is 1-1/2km/h
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CBSE 8 - Maths
Three friends, X, Y and Z complete the work in x days, (x+5) days and 12 days respectively. they started to work together but X left the work after 2 days and just left the work one day before the completion of the work. if the total work completed in (53/9) days, then find the value of x. Answer is -->10  (solve + explain)
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CBSE 8 - Maths
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CBSE 8 - Maths
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CBSE 8 - Maths
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CBSE 8 - Maths
The ratio of number of girls and boys in a class is 1:3. Set up an equation between the students of a class and boys and then draw its graph. Also find the number of boys in a class of 40 students from the graph. 
Asked by manmeetsaini1516 | 29 Jun, 2022, 03:21: PM
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