Question

if cost of 5 books is rupees 400 then calculate cost of 15 books​

Answer 1

your answer is 1200

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Answer 2

Answer:

the cost of 5 books=₹1200

Step-by-step explanation:

the cost of 5 books =₹400

then cost of 15 books=?

so,

cost of 1 book=1200/5=80

cost of 15 books=80×15=₹1200