A puzzle for the masses

# of students, aye?

I took that into consideration, but there's next year's class, and the year after...

 

Here's another one.

You are given 5 bags. There are 10 beads in each of the bags. In four of the bags, the beads each weigh 10ozs.. In the remaining bag, each bead weighs only 9ozs. All the bags and beads look identical.

You must find out which bag has the lighter beads.

The problem is that all the bags look identical and all the beads look identical. You can use a scale, but it has to be a single-tray scale, not a two-tray balance scale. Also, you may use the scale only once.

 

"I think the clock is slow...I don't FEEL tardy..."

 

Si. Pozo hecho

 

Put all the bags (except one, if you so desire) on the scale... and remove, one at a time.

 

I thought about that too, but then I wondered if 'you can only use the scale once' was meant as 'you can only take one reading/measurement."

Any clarification on that?

 

One bead ffom bag 1, 2 beads from bag 2, etc. Weigh one time.

5 x 10 - actual weight = bag number of light bag.



P.S. where does it say there are 31 students??

You are in school and the teacher is handing out assembled packets of papers to the students, with instructions, and to fill out during and after a science experiment. The problem is he only has so many complete copies of assembled packets of papers to hand out. How many students will get a complete packet of assembled papers? What is the limiting factor?

 

It doesn't say there are 31 students - that's the problem - it doesn't say how many students there are - so how can we know how many students will get the packet of assembled papers?

The limiting factor is the number of students up to and until there are 82 students. After that, the limiting factor is the graph paper.

 

Label the bags from 1 to 5. Take 1 bead out of Bag 1, and label it 1. Take 2 beads out of Bag 2, and label them both with a 2. Take 3 beads out of Bag 3, and label each with a 3. Continue this pattern with Bags 4 and 5. Put these 15 beads on the tray of the scale.
If all 15 each weighed 10ozs, the scale would register 150ozs or 9.375lbs. But since one or more of the beads weighs only 9ozs, the scale will register less than 150ozs. Subtract the number you have on the scale from 150. Your answer will tell you the number of the bag with the lighter beads. (If the scale registers 148, it’s bag #2. If the scale registers 145, it’s bag #5.)

 

It is halloween and the doctor is dressed like luke skywalker and the kid is darth vader....what do i win?

 

Good song. Ever notice that right at the start of the song the drums almost sound like a Top Fuel dragster at idle.