Question

The cost of 12 note book and 16 pen is rs 852. What is the cost of 9 note book and 12 pen

Answer 1

Answer:

Step-by-step explanation:

Notebook + Pen = Money

12 + 16 (28) = 852

9 + 12 (21) = x

{ Direct variation }

So,

28/21 = 852/x

28x = 852 × 21

28x = 17852

X = 17852/28

X = 639

Hence, the cost of 9 notebook and 12 pens is ₹639

Hope it helps,

Mark Brainiest.

Answer 2

Let consider the cost of note book = p

and cost of a pen = q

According the question, we can say that :-

12p+16q=852..                ( given)

now we have to multiply the equation by ( $\frac{3}{4}$ )

Let see what we will get:-

( $\frac{3}{4}$ ) ×12p+ 16q=852...

=> 9p + 12q = 639

Here we will get the cost of 9 note-books and 12 pens is Rs. 639.

Ans :-  The cost of 9 note-books and 12 pens will be Rs. 639.