Question

5 copiyo or 4 pustako ki kimat 75rupee hai.6 copiyo or 2 pustako ki kimat 55 rupee h. 7 copiyo or 4 pustako ki kimat kya hogi

Answer 1

Hey,sup!

As per the question,
Let the price of copy be x and book be y.

5x+4y=75. (Equation 1) ×2.
6x+2y=55. (Equation 2) ×4.

Multiplying and subtracting.

10x+8y=150.
-24x-8y=-220.
______________
-14x = - 70.
x = -70/-14.
=5.
Price of copy be 5Rs.

Substituting value of x in equation 1.

6x+2y=55.
6*5+2y=55.
30+2y=55.
2y=55-30=25.
y=25/2=12.5

Price of book = 12.5Rs

So , price of 7 books=7x=7*5 = 35Rs.
Price of 4 books=4*12.5= 50Rs.

Total price = 35+50=85Rs.

Hope it helps.