Question

A photo is 6 inches long. Kamala enlarged the photo so that it is twelve inches long. By keeping the same proportion of the photo, what would be the width of the photo if the enlarged photo is 8 inches wide?

Answer 1

@abb0t

Answer 2

so
lets call W-the new width , L - the new length
w - the old width and l - the old length
you know
W=8,L=12 and l=6

Answer 3

now you know since they kept the same proportion of the photo:
W/L = w/l
w = l*W/L

Answer 4

can you do it now ?

Answer 5

No

Answer 6

just plug in the numbers.

Answer 7

I don't understand

Answer 8

"so
lets call W-the new width , L - the new length
w - the old width and l - the old length
you know
W=8,L=12 and l=6
"
this is fine ?

Answer 9

So the new width is 16

Answer 10

no, W/L = w/l
w = l*W/L

Answer 11

W/L is the new proportion
and
w/l is the old proportion

Answer 12

I am so lost

Answer 13

the proportions are equal
so
W/L = w/l
now you have to isolate w and plug in the values of W, L and l

Answer 14

you KNOW the new width .. they ask you what is the width before

Answer 15

ok I understant that part

Answer 16

so, you know W,L and l
you want to find w.
since the proportions are equal
W/L = new proportion
w/l = old proportion
->
w/l = W/L

Answer 17

agree ?

Answer 18

Yes

Answer 19

so,
w/l = W/L
multiply both sides by l
w = W*l/L
w=8*6/12=4

Answer 20

are you there ?