budhathokiyubraj2
budhathokiyubraj2 budhathokiyubraj2
  • 15-03-2021
  • Mathematics
contestada

The cost of 10 books and a pen is Rs 840. If the cost of a pen is Rs 40, find the cost
of a book.
​

Respuesta :

rorycampbell0721
rorycampbell0721 rorycampbell0721
  • 16-03-2021

Answer:

80

Step-by-step explanation:

let b be the cost of a book, then:

[tex]10b + 40 = 840\\10b = 800\\b = 80[/tex]

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