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1 pencil = 1 Rs 1 pen = 5 Rs and 20 chalks = 1 Rs then help me to buy 100 items for 100 Rs.

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1 pencil = 1 Rs
1 pen = 5 Rs and
20 chalks = 1 Rs
then
help me to buy 100 items for 100 Rs.
(all three types of items must be included)

posted Nov 27 by Nikhil Pandey

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1 Answer

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1 pencil, 19 pens and 80 chalks


1) x+y+z=100
2) 1*x+5*y+1/20*z=100
Subtract the 2 above:
4y=0.95z --> 80 y = 19 z --> solution less than 100 ---> y=19, z=80 and x= 1
so we get 1 pencil, 19 pens and 80 chalks (1+95+4=100)

answer Nov 27 by Hanifa Mammadov



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