The price of 4 notebooks and 7 pens is 115 rupees; and the price of 4 notebooks and 2 pens is 90 rupees. What is the price of a notebook? What is the price of a pen ?
Answers
Answered by
0
Step-by-step explanation:
4÷90=22.20
this is the price of one book
2÷90=45
this is the price of one pen
Answered by
5
Answer:
the price of one notebook is 20
the price of one pen is 5
Step-by-step explanation:
let the price of one pen be x
let the price of one notebook be y
=>7x + 4y = 115 --(1)
=>2x + 4y = 90 --(2)
subtract (2) from (1)
7x + 4y - ( 2x +4y ) = 115 - 90
5x = 25
x = 25/5
x = 5
price of one pen = 5
2x + 4y = 90
2(5) + 4y = 90
4y = 90 - 10
4y = 80
y = 80/4 = 20
the price of one notebook is 20
the price of one pen is 5
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