Question 397749
 The resistance of copper wire varies directly with its length.
 A copper wire 275 feet long has a resistance of 950 ohms.
 What is the resistance of 1,575 feet of copper wire? 
:
That's a lot more resistance than actual, but anyway:
:
Let r = resistance of 1575 ft of wire
:
{{{275/950}}} = {{{1575/r}}}
Cross multiply, solve for r
275r = 950 * 1575