Question

If the price of 6 books and 7pens is 79rs. and 7 books 5pens is 77rs. then find the cost of 1book and 2pen.

Answer 1

Answer:

6 books+7pens=79

7books+5pens=77

let book and determine be x and y

so,6x+7y/7x+5y=79/77

77(6x+7y)=79(7x+5y)

462x+539y=553x+395y

539y-395y=553x-462x

144y=91x

y=91x/144