# Automobile Maintenance Mandy purchased two new steel-belted all-weather radial tires for her car. The tread depth on the new tires measures 11/32 of an inch. The dealer told her that when the tires have worn down and their tread depth measures 1/8 of an inch, she should replace the worn tires with new ones. How much will the tread depth decrease over the useful life of the tire?

Automobile Maintenance Mandy purchased two new steel-belted all-weather radial tires for her car. The tread depth on the new tires measures 11/32 of an inch. The dealer told her that when the tires have worn down and their tread depth measures 1/8 of an inch, she should replace the worn tires with new ones. How much will the tread depth decrease over the useful life of the tire?
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Reinfarktq6
We just gotta subtract them
$\frac{11}{32}-\frac{1}{8}$
LCD of 32 and 8 is :32
So, get the denominator to be 32
$\frac{11}{32}-\frac{1}{8}\phantom{\rule{0ex}{0ex}}\to \frac{11}{32}-\frac{4}{32}\phantom{\rule{0ex}{0ex}}\to \frac{11-4}{32}\phantom{\rule{0ex}{0ex}}\to \frac{7}{32}$
So tread depth decreases by 7/32 inches during the useful life of the tires