MHSB - 7 - Maths :: Direct and Inverse Proportion

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[Author - Kripa S]

http://cart.ebalbharati.in/BalBooks/pdfs/701020004.pdf#page=72 (Marathi)

[Author - Kripa S]

https://www.youtube.com/watch?v=KppJGjvABVo (ratio and proportion)

https://www.youtube.com/watch?v=p1LIeJeKT38 (proportion example)

[Author - Kripa S]

http://www.edpax.com/media/managed/large/ratio_proportion_2nd_41.png (direct proportion example 1)

http://www.rpdp.net/mathdictionary/english/vmd/images/e/equivalentratios.gif direct proportion example 2)

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTHyX4m1veFeiPuZymoJGrmR8_G1Hi8qZKBzfUE66geuwYD0ry0 (direct proportion example 3)

https://doubleconformal.files.wordpress.com/2014/11/inversionbubblec2.png (inverse proportion example 1)

[Author - Kripa S]

1. One pen costs 5 rs. How much with 10 pens cost? Is this direct proportion or inverse proportion? Why?

2. In 1 day, my sister reads 20 pages of a book. In how many days can she finish a book of 200 pages? If my sister reads 25 pages in a day, in how many days can she finish the book? Is this direct proportion or inverse proportion? Why?

[Author - Sushant Raut]

https://drive.google.com/open?id=0BzNF2YyqQxJ-UWdBdDdlWkt5WDg

[Author - Sushant Raut]

https://drive.google.com/open?id=0BzNF2YyqQxJ-cWVkd0tVT2JRWHM

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