If the cost of 20 books is Rs 180 how much will 15 books cost ​

If the cost of 12 books is Rs 144, then the cost of 18 books is (a) Rs 206 (b) Rs 216 (c) Rs 198 (d) Rs 180

If 6 note boks cost Rs. 45, how much would 8 note books cost?

The cost of 12 books is Rs. 144. Find the cost of 18 books.

The cost of 5 books is Rs. 40. What is the cost of 7 books?

If the cost of 15 books is Rs90, then what is the cost of one book?

If the cost of a book is Rs.25.75 ,find the cost of 24 such books.

If the cost of 15 mangoes is Rs 180, then what is the cost of 25 mangoes (in Rs)?