Wendy can build a fort in 75 days, Al can build the same for in 50 days. They want to build a family fort this summer. If Wendy and Al work together on the fort, they will need at least how many days?

Answer 1

1/75 + 1/50 = 1/X

multiply by 150X

2X + 3X = 150

5X = 150

X = 30 days working together