Question

on a map 15mm represent 100 km.how many mm will be in 625c?

Answer 1

@rosy
do you mean 625 cm?

Answer 2

i think c denote cm...actually it is also confusing me..

Answer 3

we know 1cm =10mm
so 625cm =625*10 mm

Answer 4

1 cm = 10 mm
so 625 cm = 6250 mm
15/100 = 6250mm/x (15mm to 100km = 6250mm to x km)
cross multiply
15x = (6250)(100)
15x = 625000
x = 625000/15
x = 41666 km
you better get a second opinion on this

Answer 5

what is the relation between cm and km?
means 1 km=?cm

Answer 6

you can try using a conversion factors
such that
c = 1
mm = 10
k = 1000



you can also try doing the same with
km
try to compare the 2 lengths smaller or larger
try to go step by step
from mm then to cm then to km
then compare

Answer 7

your problem is saying 15 mm = 100 km
and 1 cm = 10 mm so 625 cm = 6250 mm
so, 6250mm/15 = 416.66 x 100 = 41666

does that make sense @mth3v4

Answer 8

i probably skipped a 0 on the centi

Answer 9

the method is done the same way :P

Answer 10

I made a proportion by putting cm on top and km on bottom

Answer 11

lol i did not see
i spent so much time on that 1 (i think you could tell)

Answer 12

no wait..oops...I put mm on top and km on bottom

Answer 13

y does it seem that we are trying to solve the problem again ...

Answer 14

15 mm /100 km = 6250 mm / x km (6250mm = 625 cm)
can it be solved that way ?

Answer 15

ok lemme try to solve it

Answer 16

@Hero ..are we doing this correctly ?

Answer 17

@ganeshie8 ..are we doing this correctly ?

Answer 18

Just convert km to cm. Then create a proportion. Not nearly as difficult as everyone is making it.

Answer 19

I converted cm to mm and used a proportion

Answer 20

does 15mm = 100 km ?

Answer 21

because in the problem, 15 mm represents 100 km

Answer 22

It's not equal to it. It "represents" it. It's a scale conversion.

Answer 23

15mm, in reality, is much smaller than 100km. So it can't be equal to it.

Answer 24

so you couldn't convert km to cm in this problem, could you ?

Answer 25

Why couldn't we?

Answer 26

so your saying convert 625 cm to km ?

Answer 27

You can do that too. Either way would work. as long as you have consistent units, you'll be able to create the proportion.

Answer 28

@texaschic101

Answer 29

so is my proportion I posted above one of the correct ways to set it up ?

Answer 30

The units have to be consistent. You need two mm measurements and two km measurements.

Answer 31

In proportion to each other.

Answer 32

I believe I set it up correctly....it just look weird

Answer 33

Well, you are correct. It does LOOK weird.

Answer 34

Because I got 6250 mm to 41666 km

Answer 35

I looked at it again. You appear to have it.

Answer 36

But try to express yourself more clearly next time. Use Latex or the drawing board.

Answer 37

thanks for taking the time to check it....my real face was looking like my avatar , except for the yellow

Answer 38

Another thing is, I always set up the proportion so that units can be canceled. So I would set it up like this:

\[\frac{15 \text{mm}}{6250 \text{mm}} = \frac{100 \text{km}}{x \text{km}}\]

Answer 39

Then after cancelling units you end up with

\[\frac{15}{6250} = \frac{100}{x}\]

Answer 40

Then you can easily solve for x no problem.

Answer 41

ohhh...I see...I like that better

Answer 42

thanks.....your my hero...lol :)

Answer 43

yw

Answer 44

I set all of that up assuming your conversions were correct. However, think @matricked has the right approach.

Answer 45

We're supposed to be looking for mm, not km

Answer 46

oh....I thought we were looking for km

Answer 47

But you still converted it to km. However you already converted to mm, which is what the problem asked for.

Answer 48

I only meant to convert to km so that you would be able to set up a proportion so solve for the unknown millimeters. I hate jumping in to a problem late.

Answer 49

I feel stupid now

Answer 50

Don't feel stupid. Everyone makes silly mistakes every now and then.

Answer 51

I feel silly for not realizing you had already included the converted mm value we needed to find.

Answer 52

but it says right there in the problem cm to mm.......and I had to drag km in there

Answer 53

I try to trust that the other person if they are helping someone knows what they are doing. But I shouldn't do that.

Answer 54

why is km even in the problem then ?

Answer 55

The thing is, I still would have converted cm to km, then set up the proportion.

Answer 56

lol...thanks again.....I think I am just tired and delirium is setting in

Answer 57

@matricked took a short cut.

Answer 58

i think you are looking for the answer in cm :P

Answer 59

@mth3v4, what are you talking about?

Answer 60

"i think"

Answer 61

I think you are looking for mm

Answer 62

The problem clearly states what needs to be found @mth3v4

Answer 63

ok my bad

Answer 64

@Hero
The use of mathemical knowledge should make the work easier and logical rather than the opposite

Answer 65

I feel better now...I am not the only one who is delirious...lol

Answer 66

i was saved "i thought"

Answer 67

Hero saved us both

Answer 68

@matricked, I get what you're saying, but to each his own. As long as you get to the desired result. Next time, if have something of that nature to share with me, we can discuss it via messaging.

Answer 69

i meant in my extraordinarily particular common for me" case :P

Answer 70

YAWN...good night guys.....c ya tomorrow

Answer 71

gn

Answer 72

that was fun ^^

Answer 73

look at the statement...we have to find mm not km??????

Answer 74

but @hero you are letting x km.......is'nt it wrong

Answer 75

625 cm = 6250 mm