write a proportion that could be used to solved for the variable.then solve 16 walls in 40 hours, 3 walls in h hours
The way to set this up is to express it in terms of walls per hour. So in walls per hour, the first of these is
Both of these are divisible by 8 so we can say that 16 walls in 40 hours is equal to
2 walls per 5 hours or 2/5
Now, this means that
2/5 = 3/h
By solving for h, we will know how many hours it takes to do 3 walls. We can solve for h by cross multiplying. That gives us
2h = 5*3
2h = 15
h = 7.5
So at the rate of 16 walls in 40 hours, 3 walls will take 7.5 hours.
16 walls in 40 ours
3 walls in h hours
We are going to use ratio properties :
3*40= 16 *h
==> h= 3*40 /16 = 120/16= 12/2 = 7.5 hours.
16 walls in 48 hours ,3walls in h hours.
The required proportion is 16 walls : 40 hours = 3 walls: h hours. Or
40 hrs : 16walls = h hrs : 3walls
16 walls/40 hours = 3walls /h hours . This implies the numbers of walls constructed per hour is same. Or
Therefore h/3 = 40/16 in pure ratio.
So h = (40/16)3 = 7.5 hrs.