Amalia can read 4 pages of her book in 2 minutes. How many minutes will it take her to read 18 pages of her book?
Think hard. Detailed solution:
9
Amalia can read 1 page in 2 / 4 = 0.

5 minutes.

Hence, she can read 18 pages in 18 x 0.

5 minutes = 9 minutes.

.

Final answer: 9