Question

the cost of a book is ₹ 12 more than 3 times the cost of a copy the sum of their cost is ₹72 find their cost ​

Answer 1

let the cost of copy =Xrs

then the cost of book = 3X+12rs

the sum of cost of book or copy = 72

X+3X+12= 72

4X+12 = 72

4X= 60

X= 15

the cost of copy,= 15rs

the cost of book= 57rs

Answer 2

Cost of book is 42
And cost of copy is 30
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