Question

The cost of 7 books and 3 notebooks is 180 the cost of 4 notebooks is rupees 100 how much amount should I pay if I buy 3 books and 3 notebooks

Answer 1

Answer:

Step-by-step explanation:

Let x=books,and

y=notebooks

=>7x+3y=180 ......(1)

=>4x=100

=>x=100/4

=>x=25

substitute x=25 in equation...(1)

=>7x+3×25=180

=>7x+75=180

=>7x=180-75

=>7x=105

=>x=15

x=15 ,y=25

Price of 3 books and 3 notebooks=3x+3y

=>3×15+3×25=45+75=120

=>3x+3y=120

answer is 120