Question

Shubham spent rs 690 for buying some books and pens. A book costs rs 20 and pen costs rs 5. The total no. of items bought by Shubham is 108. How many of each it did he buy

Answer 1

20X +
$20x + 5 \times (108 - x) = 690 \\ 15x + 540 = 690 \\ 15x = 150 \\ x = 10$
shubham bought 10 books and 98 pens