Question

cost of 5 book and 4 notebook is 100 if the cost of one book is 12 find the cost of one notebook

Answer 1

5 books+4 notebooks=100
let book=y;notebook=x
y=12
5y=5*12=60
⇒60+x=100
x=100-60=40
4x=40
x=40/4=10
∴cost of one notebook is 10/-.

Answer 2

Cost of 5 books and 4 note books=100
Cost of 1 book=12
Cost of 5 book=12 multiplied by 5
=₹60
Cost of 5 books and 4 notebooks = 100
Cost of 5 books =60
Cost of 4 notebooks =100-60
=40
Cost of 1 notebook= 40 divided by 4
=₹10