Problema Solution
Tommy can paint a fence in 9 hours. If his friend Huck helps, they can paint the fence in 1 hour. How fast could Huck paint the fence by himself?
Answer provided by our tutors
"Tommy can paint a fence in 9 hours."
That means that he can paint 1/9 of the fence in an hour.
"If his friend Huck helps, they can paint the fence in 1 hr. "
Which means that, in an hour, Huck can paint the remaining 2/9 of the fence.
If Huck can paint 2/9 of the fence in an hour, he should be able to pain the whole fence in 9/2 hours
ie, in one four a half hours.