Question

sylvia set a treadmill for 38 minutes, and so far she has run 61% of the minutes. which is the best estimate for the number of minutes sylvia has run so far? 18 minutes 21 minutes 24 minutes 28 minutes

Explanation:

Step1: Identify the problem

We need to find 61% of 38 minutes to estimate the time Sylvia has run so far.

Step2: Estimate the percentage and the number

First, approximate 61% as 60% (or 0.6) and 38 as 40 for easier calculation.

Step3: Calculate the estimate

Now, calculate 60% of 40. Mathematically, this is $0.6\times40 = 24$. But let's also check with the original numbers. 61% of 38 is $0.61\times38$. Let's calculate that: $0.6\times38 = 22.8$ and $0.01\times38 = 0.38$, so total is $22.8 + 0.38 = 23.18$. Now, looking at the options, 24 is the closest estimate (since 23.18 is close to 24, and our approximation with 60% of 40 gave 24, and the other options: 18 is too low, 21 is low, 28 is high).

Answer:

24 minutes (the option with "24 minutes")