Math Block? Again!?

Question

Can somebody teach me the steps and the answer to the problem?

Ned stocks shelves at the grocery store. He can stock an average of 4 boxes in 20 minutes At this rate, approximately how long will it take him to stock the 42 boxes that were delievered to the store.

Answer 1

Proportional Problem

4/20 = 42/ x

4x = 20(42)

4x = 840

4x /4 = 840 / 4

x = 840 / 4

x = 210 minutes

210 minutes = 3.5 hours

- - - - - - - -

method 2

divide 4 into 20 to get time per box

20 / 4 = 5

5 minutes per box

There are 42 boxes to stock

multiply 42 times 5

42 x 5 = 210

It will take 210 minutes to stock 42 boxes

- - - - - - - - -s-

Answer 2

If 4 boxes takes 20 minutes
then
8 takes 40
12 takes 60 minutes, or 1 hour
16 takes 80

and so on.

Or reversed,
In 10 minutes, he stocks 2 boxes
in 20, 4
in 30, 6

and so on

Or, better yet, in 5 minutes, he stocks 1 box.

So the rest should be pretty obvious.

Answer 3

well if it takes him 20 minutes to stack 4 boxes then you would divide 42 by 4 which is 10.5 then times that by 20 minutes

OR find out how many minutes it takes to stack ONE box by dividing 20 by 4 which is 5. Then times that by the number of boxes he has to stock 42.

Either way you get 210 minutes or 3.5 hours

Answer 4

So, you would go 4 box 1box
---- = ----
20 min. 5 min.

(basicly 1 box in 5 minutes)

so then you go 5 x 42 = 210 so it would take him 3 hours and 30 minutes


ANSWER=
3 HOURS AND 30 MINUTES OR 3 and 1/2 HOURS

Answer 5

4 boxes in 20 minutes
is the same as
one box in 5 minutes.
That's his average rate.
so...
for 42 boxes you just multiply both sides by 42
and get 42 boxes in 210 minutes.

Answer 6

1 box=5min.

5x42=

210 minutes