A pool can be filled by one pipe in 30 hours and by a second pipe in 120 hours. How long will it take to fill the pool using both pipes? It will take \( \square \) hours to fill the pool.

Amanda wrote 3 stories in Writer's Workshop. Each story was 6 pages long. She drew 2 illustrations on each page. How many illustrations did Amanda draw altogether?

Mrs. Andrew's classroom has 4 rows of desks with 3 desks in each row. She placed 2 pencils on each desk. How many pencils did Mrs. Andrew place on the desks altogether?

2. Pasar de decimal a racional (Fracción Generatriz) a) 3,235

15. \( \frac{1}{15}+\frac{6}{5} \div \frac{12}{7} \)

18. Isaac bought three packages of nuts He bought one package of peanuts the weighed 3.07 pounds. He also bought two packages of pecans that weighed 1.46 pounds and 1.5 pounds. Did the peanuts or the pecans weigh more? Hours much more?