
Nathan B. answered 03/17/15
Tutor
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Elementary and Algebraic skilled
In my opinion, nothing happened to it. Each of the three men started by paying $10. They were supposed to pay only $25. The bellhop gave each of them one dollar back, pretending the bill final bill was $27.
The mental trick is thinking the 3x =30, and then the splitting of the five to the men and bellhop causes 27 + 2 = 29 ≠ 30.
The mental trick is thinking the 3x =30, and then the splitting of the five to the men and bellhop causes 27 + 2 = 29 ≠ 30.
What really is happening instead of 3x = 30 is 3x + 5 = 30, or after subtracting five from both sides, 3x = 25, which translates to 8 1/3 per man for the actual cost of the room.
What happened to the other two thirds of each dollar? That went to the bellhop: 2/3 * 3 = 2 that he actually took.
The other three dollars were returned to the men.
30 (what the first payment is) = 25 (what the clerks true cost is) + 2 (bellhop takes) + 3 (return)
Then 3 dollars are returned, which has their room cost the 27 dollars
27 (what the men had) - 2 (what the bellhop took) = 25 (what the clerk says is the final room cost)
If you want to see it in simple mathematics, it looks like this:
30 = 25 + 3 + 2
30 - 3 = 25 + 2
27 = 25 + 2
27 - 2 = 25
So long story short, we weren't trying to add up to 30, we were trying to deduct down to 25.