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May works at Jack's bicycle repair shop. She needs to put a new tire on Ashley's bike, but the old tire is gone. She measures one of the spokes (11.5 inches) and goes over to the tire rack, selecting a new tire. How did she know which tire to choose? Round your answer to the nearest tenth.

a) She chose a tire with a circumference of 36.1 inches.
b) She chose a tire with a circumference of 35.3 inches.
c) She chose a tire with a circumference of 41.2 inches.
d) She chose a tire with a circumference of 38.5 inches.

User Wimagguc
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1 Answer

4 votes

Final answer:

To find the correct tire circumference, double the spoke length to get the diameter (23 inches), then calculate the wheel's circumference using C = π*d, resulting in 72.22 inches. None of the provided options accurately match this measurement, suggesting a potential issue in the question or options.

Step-by-step explanation:

The student's question is about determining the correct tire circumference for Ashley's bike based on the length of one spoke, which is 11.5 inches. To solve this, we should recall that the diameter of the wheel can be found by doubling the length of the spoke because the spoke reaches from the center to the edge of the wheel. So, the diameter is 11.5 inches times 2, which equals 23 inches.

Now, to find the circumference (C), which is the distance around the wheel, we use the formula C = π*d, where π (pi) is approximately 3.14 and 'd' is the diameter. Therefore, C = 3.14 * 23 inches = 72.22 inches. Since the circumference of the entire wheel includes the tire, May needed to select a tire with a circumference that, when combined with the rim, would match this measurement.

However, none of the given options (36.1 inches, 35.3 inches, 41.2 inches, and 38.5 inches) are close to the measured circumference of the wheel, which seems to indicate an error in either the question's data or the options provided.

User Tamlok
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8.6k points