Question

Cost of a book is 20 more than that of 2 times the pen. The total cost of 6 pens and 7 books is

240 Rs. What is the cost of a pen and a book?​

Answer 1

Step-by-step explanation:

let the cost of a pen is x so cost of a book =2x +20

according to the question,

6x +7 (2x+20)=240

6x+14x+140=240

20x=100

x=5

cost of one pen =5

cost of one book =2×5+20=30