Imagine Magazine - Johns Hopkins - March/April 2016 - (Page 47)
by Timothy Boester, Ph.D.
A group of your friends participated in a cleanup day at a local
park, part of a volunteering competition between schools. A few
activities didn't require any expertise, but most were completed
by your friends who have experience in carpentry (Troy and
Amanda), painting (Jake and Colleen), and gardening (Morgan
They recorded the person-hours spent on each activity. For
example, six person-hours could mean that one of your friends
worked for six hours, or two friends worked three hours each.
When an activity was split across multiple people, everyone
started and completed the activity at the same time, and no activity
was ever left partially completed at any time.
Your friends kept track of how long each activity took, but the
competition paperwork requires a timeline of the work done by
each volunteer. With what your friends remember about the day,
can you put together a timeline for each person?
The bridge is at the start of the trail, so that had to be repaired first.
Then trail maintenance could be done, and finally that sign could
We knew we'd be the last step on a lot of tasks. The trail sign could
only be painted once it was rebuilt, same with the park bench and
The day lasted from 9 AM to 5 PM. Everyone finished a task right
at noon, so we all broke for lunch for half an hour.
lumber supply run
paint supply run
gardening supply run
park bench repair
trail signage repair
trail bridge repair
trail signage painting
park bench painting
Solution for Knossos Games 23.3
There was a lot of underbrush that needed to be removed, so
we did that first. That got cleaned up during leaf raking and was
taken to be mulched on the gardening supply run. Then the flower
beds had to be weeded before flower planting, and finally mulch
I repaired the fence when we split up.
All the supply runs needed two people. The painters and
carpenters couldn't do anything without the donated supplies, so
we went first thing. The gardeners could start right away. They just
needed the flowers and mulch to be picked up at some point.
Tim Boester is an educational
psychologist who studies how
people learn math. He has
more puzzles available at
Table of Contents for the Digital Edition of Imagine Magazine - Johns Hopkins - March/April 2016
In My Own Words Senator Barbara Mikulski
Run, Ride, Sell! Funding causes that matter
Start Something! Initiatives by kids, for kids
Changing Lives, One School at a Time Making a difference for students in need
Empowered to Make a Difference The Civic Leadership Institute at CTY and CTD
Sharing the Gifts of Music The Forget-Me-Not Family Ensemble
Service, Leadership, Entrepreneurship . . . Launch! Learning the art of the startup at MIT Launch
Sharing the Rewards Building a shadowing program for my peers
Discovering the Leader Within Exploring leadership and social justice at Brown
Gap Year A time to refresh, serve, and grow
Research at the Edge of the World An Antarctic photo essay
Selected Opportunities and Resources
Off the Shelf Review of Anthony Doerr’s All the Light We Cannot See
Exploring Career Options Interview with entrepreneur Henry Albrecht, CEO, Limeade
One Step Ahead My college startup
Planning Ahead for College Skills and knowledge for college success
Students Review: Lehigh University
Mark Your Calendar
Imagine Magazine - Johns Hopkins - March/April 2016