# Solve this math problem if you want to unlock your phone [Image]

August 6, 2013 6

A car dealer offers Lachlan a car that is priced at \$21800, but he only has a \$600 deposit. Lachlan’s trade in is actually worth \$500. The finance company insists on a 10% deposit for a 22% flat rate deal, so the dealer inflates the prices of both the trade-in and the car purchased. What are the inflated prices, and what is the monthly repayment to pay of the car in 4 years?

Monthly payment rounded to the nearest dollor

First number is 0

The story behind this is a student was caught using his phone during math class. So the math teacher took the phone, changed the pin code on it, and gave the phone back to the kid with an accompanying math problem… a math problem which, once solved, gives the pin code to unlock the phone.

Side note: not all teachers can spell equally. Dollor? Seriously? I’m bad at spelling but even I’m not that bad.

[via Reddit]

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1. Seamus McSeamus August 6, 2013 at 7:19 AM (comment permalink) -

Most likely this gets the teacher in hot water for a) changing the student’s pin, and b) trying to make the kid learn something. The nerve of a teacher trying to teach… good thing it was math and not spelling, though. :p

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2. thegreenwizard August 6, 2013 at 7:37 AM (comment permalink) -

In some schools in Switzerland, if a student use the phone in school, the phone is confiscated for 30 days. This is part of the rules the students have to accept when they enlisted. So no one wants to be out of Facebook for so long. ?

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3. KMHamm August 6, 2013 at 9:07 AM (comment permalink) -

When I was teaching college, I had a strict no cell phone rule. One guy’s phone rang during class and he was dumb enough to answer it. I walked up to him with a glass of water I had on my desk and started clinking it on the desk in front of him and yelling his name to “get me anudder BEER, man!” The rest of the class started in and pretty soon we had his girlfriend (at the other end of the phone) convinced he was at a bar instead of in class, even tho he stayed on the phone trying to convince her he wasn’t. Word got around. Never had a repeat of the incident.

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4. David Roper August 6, 2013 at 11:57 AM (comment permalink) -

I was in jail recently and used their cell phone, it was on the wall next to my cell.

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5. Darcy August 7, 2013 at 9:08 AM (comment permalink) -

[@KMHamm] ROFLMAO! I love it! The perfect solution.

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6. Darcy August 7, 2013 at 9:13 AM (comment permalink) -

My last college also had a strict “no cell phone policy.” I never had to worry about it because my coverage ended at the top of the last hill before the college. Imagine my shock when I received a call in class one day, the cell phone provider had built a new tower that I knew nothing about. Luckily the teacher knew me and I was a good student, he accepted my explanation. (Probably helped that I turned the phone off immediately.)

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