|
In January we invited you to find some unusual
and interesting ways to number 20 things in sequence.
This month’s math puzzle was submitted by
Jean Marie Fade:
The Schlumberger
center in Angola has 20 offices that each need to have a number placed
on the door.
The office manager will purchase metal numerals and nail them to the
doors. The cost of the numerals varies depending on the digit:
| Numeral |
|
Cost |
|
|
|
|
So,
for example, putting the number 6 on a door would cost 6 Kwanzas.
The number 13 would cost 4 Kwanzas. The number 10 would cost 11
Kwanzas.
The
only requirement is that the numbers be in consecutive order. What
is the least expensive way to do the job?
|
| 1 |
|
1 Kwanza |
|
| 2 |
|
2 Kwanzas |
|
| 3 |
|
3 Kwanzas |
|
| 4 |
|
4 Kwanzas |
|
| 5 |
|
5 Kwanzas |
|
| 6 |
|
6 Kwanzas |
|
| 7 |
|
7 Kwanzas |
|
| 8 |
|
8 Kwanzas |
|
| 9 |
|
9 Kwanzas |
|
| 0 |
|
10 Kwanzas |
|
|
|
|
|
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