Posted by **Izabel** on Monday, January 24, 2011 at 3:50pm.

The ratio of the length of a rectangular field to its width is 10:7 if the width of the field is 70 meters find the perimeter of the field.

- Pre Algebra -
**helper**, Monday, January 24, 2011 at 4:27pm
length = L

width = w

Ratio = L:w = 10:7 = L:70

10:7 = L:70

10/7 = L/70

cross multiply

700 = 7L

L = 100

L = 100, w = 70

P = 2w + 2L

P = ?

- Pre Algebra -
**Reiny**, Monday, January 24, 2011 at 4:30pm
let the length be 10x

let the width be 7x , ( notice the ratio 10x : 7x = 10:7 )

given : 7x = 70

x = 10

Perimeter = 2(10x+7x) = 34x = 340

check:

length =100

width =70

perilmeter = 100+100+70+70 = 340

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