Posted by **♫J.R.♫** on Wednesday, May 9, 2012 at 8:31pm.

A tire shop that sells only one size of tire, .75 metres in diameter, decides to sell tires for big rigs that are 1.5 metres in diameter. If the cost of the .75 meter tires is $100.00 for four, how much will it cost for the 18 tires required for a big rig? Prices increase proportionally with size.

x = price for each big rig tire

Size Price/tire

0.75m $100/4 = $25.00 each

1.5m x

Solve for x:

0.75m/$25.00 = 1.5/x

0.75x = 1.5 * $25.00

0.75x = $37.50

x = $50.00/tire

Price for 18 tires = 18($50.00) = $900.00

- Math -
**Rezu**, Wednesday, May 9, 2012 at 9:11pm
Yup. It's $900.00

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