This past Saturday, Jack worked for 3 hours mowing the lawn and doing chores in the house. Mowing the lawn burns 352 calories pe

Question

1 month ago

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This past Saturday, Jack worked for 3 hours mowing the lawn and doing chores in the house. Mowing the lawn burns 352 calories pe

r hour and doing chores burns 136 calories per hour. If he burned a total of 570 calories, how long did it take him to mow the lawn?

Mathematics

1 answer:

AnnZ [12.3K] · Answer 1 · 2026-04-05T14:21:33+03:00

Let x represent the time invested in mowing the lawn, and y for the chores done. Then,
x + y = 3
Additionally, 352x + 136y = 570

From the first equation, we can express y as 3 - x, and substitute into the second equation:

352x + 136(3 - x) = 570
Solving gives us 216x = 570 - 136(3) = 162
Thus, x = 162/216 = 0.75

This indicates he dedicated 0.75 hours (or 45 minutes) to mowing the lawn.