## 155. Math Puzzle $4 / 78$

A new gardening season has begun. First, the Thälmann Pioneers want to fence their $50 \mathrm{~m}$ long and $20 \mathrm{~m}$ wide school garden. The $2 \mathrm{~m}$ wide gate is already in place on one of the long sides, and $3 \mathrm{~m}$ long fence panels can be delivered.

How many fence panels do the Pioneers need and how many fence posts must they set, if each panel is held by two posts?
The Thälmann Pioneers needed 47 fence panels, each 3 meters long, for all four sides of the school garden.

| 1st Long Side 50 m | 17 Fence Panels |
| :--- | ---: |
| 2nd Long Side 48 m | 16 Fence Panels |
| 1st Short Side 20 m | 7 Fence Panels |
| 2nd Short Side 20 m | 7 Fence Panels |
| Total | 47 Fence Panels |

For these 47 panels, 46 fence posts need to be set. Four posts are already in place at the corners. Then, six posts are still missing on each of the short sides and 16 posts are missing on the long side without the gate. Since the gate is already in place on the front side, the Pioneers only need to add 14 more posts (4 + 12 + 16 + 14 = 46).