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...
