When bill, samantha and ronnie work together, they finish that work in 20 minutes. how long does it take each person to finish that same work individually?

Ihave this math question 2/3 ÷2 1/10=

Each of the four sides of a swimming pool measures 9 meters. the pool is 5 meters deep. how much water will be needed to fill it completely? a. 45 cubic meters b. 81 cubic meters c. 225 cubic meters d. 405 cubic meters reset next

10% of 1,900,000. show me how you got the answer