Answer: 5/16
Explanation:
If 1/8 of a fence is built in 2/5 of an hour, the question is how much of the fence will be completed in an hour.
To be able to solve this, we need to figure out what to multiply 2/5 of an hour by to make it become 1 hour so that we can do the same to 1/8.
To do this, we can divide 2/5 by 1. 1/(2/5) = 2.5. This means 2/5 x 2.5 = 1. If we have to multiply 2/5 x 2.5 to make 1 hour, then we have to multiply 1/8 x 2.5 to find the amount of fence done in one hour.
(1/8) x 2.5 = 0.3125. 0.3125% of the fence will be completed in 1 hour, or 5/16 of the fence.