Question

The price of 3 note books and 5 pens
together is 75 rupees. The price of 3 note books
and 10 pens together is 90 nupees. What is the
Price of a note book ? what is the
price of a
pen?
​

Answer 1

Answer:

price of a pen is 3rs, price of a notebook is 20rs

Step-by-step explanation:

Let us suppose the cost of notebook be x and cost of a pen be y

1st condition,

3x+5y=75

2nd condition,

3x+10y =90

Subracting 2nd and 1st, we get,

5y=15

y=3

hence cost of pen is 3rs

Substituting y=3 in 2nd

3x+3(10)=90

3x=60

x=20

hence cost of notebook is 20rs

Hope it helps

Please mark as brainliest

Answer 2

Answer:

Let us consider the number of notebooks as x and number of pens as y.

Price of 3 notebooks = 3x

Price of 5 pens =5y

Total Price = 75

Equation -1 : 3x+5y=75

Price of 3 notebooks = 3x

Price of 10 pens = 10y

Total Price = 90

Equation-2 : 3x+10y=90

By subtracting equation 1 from 2 we get,

=> 3x+10y - (3x+5y)=90-75

=> 3x +10-3x-5y = 15

=> 5y = 15

y=5, by substituting y=5 in any equation , we get

x= 50/3 = 13.33....

Therefore price of notebook = Rs. 13( approx.) and price of pen = Rs.5