Question

the cost of two textbooks and one notebook is ₹255 and the cost of 3 notebooks and 1 textbook is ₹240 find the cost of 1 notebook​

Answer 1

Step-by-step explanation:

Let say price of one book is X, and price of one pen is Y.

2X+3Y =225

3x+4Y= 320

By multiplying 3 in equation 1 and multiplying 2 in equation 2

6X+9Y =675

6X +8Y = 640

So by elimination method Y is equal to 35.

The cost the cost of one pen is 35 rupees.

Answer 2

Answer:

₹45

Step-by-step explanation:

Let cost of 1 textbook be t

Let cost of 1 notebook be n

Statement 1 -

2t + 1n = ₹255

>> n = 255 - 2t

Substituting the value (n = 255 - 2t) in Statement 2

t + 3n = ₹240

>> t + 3(255 - 2t) = ₹240

>> t + 765 - 6t = 240

>> 765 - 240 = 6t - t

>> 525 = 5t

>> t = 105

Cost of 1 textbook = ₹105.

Cost of 1 notebook

=> (substitute cost of 1 textbook in Statement 1)

=> 2*105 + n = 255

=> 210 + n = 255

=> n = 255 - 210

=> n = 45

:. Cost of one notebook = n = ₹45.