In the united states, 13 out of every 20 cans are recycled. what percent of cans are recycled?

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?