Question

Cost of 5 books and 4 notebooks is Rs. 100. If the cost of
ane book is Rs. 12, find the cost of one notebook.
​

Answer 1

Let the cost of one book be x

And the cost one notebook be y

So,

5x + 4y =100

putting the value of x

5(12) + 4y = 100

60 + 4y = 100

4y = 100 - 60

y = 40/4

y = 10

So the cost of one notebook is 10

Proof

5(12) + 4(10) = 100

60+ 40 = 100

100 = 100

RHS = LHS

Answer 2

answer

10

Step-by-step explanation:

cost of 5 books and 4 notebook=100

cost of 1 book =12

cost of 5 books=12*5=60

cost of 4 notebooks=100-60=40

cost of 1 notebook=40/4=10