Question

a pencil cost ruppes 0.25a pen costs rupees 10 and a book costs ruppes 25how many each one should buy so that total number of articles is 100 and the total amount is rupees 1000
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Answer 1

No of pencils = x
No of pens =y
No of notebooks =100-x-y
1/4x+10y+25(100-x-y)=1000
X+40y+10000-100x-100y=4000
-99x-60y=-6000
33x+20Y=2000
Y= (2000-33x)/20
X=20 ,y=67
So he bought 20 pencils
67 end
13 note books