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
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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
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