find the missing length of 2 similar rectangles if the 1st has length n meters and width 8 meters and the 2nd?

Question

has length 15 meters and width 10 meters?
2] find the missing length of 2 similar retangles if the 1st has length n inches and width 16 inches and the 2nd has length 15 inches and width 12 inches?

Answer 1

1. 12 meters. The similarity gives you the ratio.
2. 20 inches. Same thing

Answer 2

1.
n/15=8/10
10n=120
n=12 meters

2.
n/15=16/12
12n=240
n=20 inches

Answer 3

if the triangles are similar then the corresponding sides are proportional
n/8=15/10 and so n=12"
n/16=15/12 and so n=20"

Answer 4

Normally I would say to do your own work, but I'll help.

Use a simple ratio.

Problem one-
1)8/10=n/15
2)120=10n
3)120/10=n
4)12=n

Problem two-
1)12/16=15/n
2)240=12n
3)240/12=n
4)20=n

I hope this is useful. I know it helped me pass.