Question

What is the cost 3 notebooks? When 10 notebooks cost is Rs. 400

Answer 1

Answer:

Rs.120

Step-by-step explanation:

10 notebooks = Rs.400

1 notebook = 400/10

= Rs. 40

3 notebooks = 40 × 3

=Rs. 120

Answer 2

let the cost of 1 notebook be x

so, cost of 10 notebooks be 10*x = 10x

cost of 3 notebook = 3*x = 3x

we have,

10x = 400

3x = ?

cross multiply

3x*400/10x

1200x/10x

x cut and 1 zero cut

=120

so 3x = 120