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STANDARDS
CCSS: 7.EE.B.4.A
TEKS: 7.10A, 7.11A
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Greener Tires
Courtesy of Bridgestone
A pit crew uses eco-friendly tires at an IndyCar race in May 2022.
More than 2 billion rubber car tires are made every year. But the source of rubber isn’t always eco-friendly. Natural rubber comes from rubber trees that grow only in tropical areas and are prone to disease. Artificial rubber is made from petroleum products.
Tire-maker Bridgestone wanted a greener solution. It found it could make rubber out of guayule (gwhy-OO-lee), a hardy shrub that grows in dry climates.
Bridgestone used this new source to make Firestone Firehawk race tires, which made their debut last summer. Drivers couldn’t tell a difference in performance between the guayule tires and the standard ones. More of these eco-friendly tires are expected to hit the tracks this season!
In one race last year, Bridgestone supplied a total of 416 guayule tires. Each car had 4 sets of the guayule tires—with 4 tires per set. Write and solve an equation to find c, the number of cars in the race. Record your work and answer on our Numbers in the News answer sheet.