Okay, so we let this one slide a bit. Sorry about that. This puzzle was originally published quite a while back, and we never got around to posting the answers. Time to correct our mistake.
First, a reminder of the rules…
Here are the rules. You must find an equation with the given numbers; inequalities would be too easy. The numbers have to be used in the order in which they appear, as they appear. No zeroes can be added. You can use any mathematical operations, signs, or parentheses you want, as long as no numbers are added (such as from a cube root), but a square root, i.e., a radical sign, is acceptable.
OK, here we go:
1. Your friend calls and tells you they will arrive in half an hour. You hang up and look at your watch: 3:32. What equation can you use to remember the time at which they are expected to arrive, 4:02?
2. You realize that between the time your friend above said they will arrive in 30 minutes and the time you hung up, one minute of conversation passed. It turns out they plan to be here at 4:01. What equation can be made out of that?
3. Pizza is for lunch! Your mom stuck it in the oven and asked you to take it out 19 minutes from now, at which time it will be 12:39. Can you think of an equation for it?
4. You have a relative whose birthday you can never remember. Perhaps an equation for it will help. The date is 7/22/81. Are you going to miss their next birthday? Try and find two answers.
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