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The total cost of six books,five pencils and seven sharpeners is rs 115 and that eight books ,ten pencils and fourteen sharpeners is Rs 190,then which of the following article`s cost can be found uniquely?(a)book (b)pencil(c)sharpeners(d)none of these ...please give me answer clearly

The total cost of six books,five pencils and seven sharpeners is rs 115 and that eight books ,ten pencils and fourteen sharpeners is Rs 190,then which of the following article`s cost can be found uniquely?(a)book (b)pencil(c)sharpeners(d)none of these ...please give me answer clearly

Grade:10

1 Answers

manna
59 Points
5 years ago
lets say b=books,p=pencils,s=sharpeners
according to question
6b+5p+7s=115-------------------------1
8b+10p+14s=190-------------------2
 
in eq 2 divide both side by 2
4b+5p+7s=95------------------3
f
substract both eq 1 and 3
 
we will get 2b=20
b=10
mean single book cost is 10 rs.
answer is book

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