How can i solve the puzzle of treasure box in virtual villagers game?

Locating the buried treasure is puzzle 15 in Virtual Villagers: A New Home. You must have Level 3 in both Construction and Science to accomplish this goal. You must also have at least one adult master builder. To find the treasure, you must drop your builder in the exact location. Normally, when you drag your builder to the right location, there will be a message at the bottom of the screen saying "Is there something buried here?" The exact location is directly south of the food bin and in line with the temple. When he locates it, he has to start digging. It may take a while before he actually starts digging (as the villagers can be quite stubborn). Simply drag the villager back to the spot over and over again until he starts digging by himself. To make the job go faster, after the scaffolding appears indicating the job has a part of it done, drag more villagers to the area and they will start digging.