Math again

As a percent how many fewer machines does 4 represent?

What?

Now you have just confused me....

What is 4 compared to 6?

How many hours it takes for each machine is an unneeded step.

I still don't understand.

I'm really really really sorry.

Contrition is good for the soul.

You have won the $100 and do not need to pass "Go".

What don't you understand?

You gave me more questions.

Couldn't you have just given the operation on what I am suppose to do?

Like:

X+y= ???

Or something.

I don't understand word problems enough as it is.

What good would that do?

If there were 3 machines it would take 4 days (half as many machines = twice as much time). So if there were 4 machines you know it's going to be more than 2 days and less than 4 days, right?

x : y
6 = 2
5 = ?
4 = ??
3 = 4

x1/x2 = y1*y2

6/3=2; 2*2=4
6/4=1.5; 2*1.5=

I mentioned it on another thread already - I still think, understanding the rule of three would be some help (like it was for others since more than 200 years).

Chum wrote-



You never know Chum with Leaka asking the questions.

He needs to understand the basic interrelations of ratios, otherwise that dog won't hunt.

You need to speak to a MATH teacher and get your fundamentals sorted out.

You decrease your machine number from 6 to 4:

6/4= 1.5

If you decrease the number of your machines, you'll have to work each machine for a longer time.

How long a time?

1.5 X 2 (days) = 3 days with 4 machines.

bit obvios!
2 divided by 3 times two.

That's not teaching.

you seem to be fairly good at algebra so hopefully this will help

the first statement 'Suppose that 6 machines can complete a given task in 2 days' can be writen as a equation

z repressent the percentage of the task that is completed by one machine in one day

2 x 6z = 100 (2 is there because this is how long it takes the machines)

so if the formula is rearranged

2 x 6z = 100
6z = 100 ÷ 2
6z = 50
z = 50 ÷ 6
z = 8.333

this shows each machine completes roughly 8% of the task in one day

a new formula can be made from the question 'If there are 4 machines, how many days would it take them to finish the same task?'

d repressents the number of days it takes

d x 4z = 100

at first this looks problematic. however we already know that z is 8.3

d x (4 x 8.333) = 100

d x 33.333 = 100

now by rearranging the equation we can get d (the number of days it takes)

d = 100 ÷ 33.333
d = 3

this shows that it takes 3 days for 4 machines to complete the task


sorry if this isnt helpful, but im not a teacher. u should really just ask ur school teacher for a little help. im sure they wouldnt mind, they would be glad that someone is actually interested in their class

The above is an excellent explanation. However, it's not too simple for a young student who's having problems with math.

The best way to teach math is to make it fun and easy.