Section D Section D Checkpoint

Problem 1

The table shows the time it took a swimmer to swim 4 lengths of a small pool at a constant rate. (One length of the pool is the distance from one end of the pool to the opposite end.)

distance in lengths of the pool time in seconds
4 96
1

  1. At that rate, how many seconds did it take her to swim 1 length of the pool?
  2. What distance did she swim in 60 seconds?
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Solution
  1. 24 seconds
  2. 2.5 lengths of the pool

Problem 2

At a store, 8 bars of soap cost $6. At that rate, how much would 60 bars of soap cost? Explain or show your reasoning. You can use a table if it is helpful.
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Solution

$45. Sample reasoning:

  • At that rate, 40 bars would cost $30, so 20 bars would cost $15. Three times 20 is 60, and 3 times 15 is 45.
  • Using a table: