Answer:
2.4 hours.
Step-by-step explanation:
Remark
The supervisor is not quite correct. The correct answer must be lower than the lowest number, otherwise you are taking out what the person with the narrower hose must be taking out what the other person is putting in.
Equation
Let x = the amount of time needed for him to fill the pool
Let y = the amount of time needed for the second person to fill the pool
Let z = the amount of time needed for both to fill the pool.
1/x + 1/ y = 1/z
1/4 + 1/6 = 1/z The common denominator is 12
3/12 + 2/12 = 1/z
5/12 = 1/z Cross multiply
5z = 12 * 1 Divide by 5
z = 12/5
z = 2 2/5
z = 2.4 hours
Answer:
6 pounds
Step-by-step explanation:
Originally
Petra : 12 pounds
Ski: 0 pounds
Delivery job
Petra & Ski: Same amount.
Represent amount with 'D'
Total Amount
Petra: 12 + D pounds
Ski: D pounds.
Petra has three times as much as Ski, meaning
12 + D = 3 (D)
12 + D = 3D
12 = 3D - D
12 = 2D
Divide both sides by 2
6 = D...
Answer:
Im not sure but i think it is 30.
Step-by-step explanation:
It’s the first one, 0.00027
