1. An adventurous snail is climbing a 10 metre high wall. Each day, it climbs up 3 metres, but each night while it sleeps, it slides back down 2 metres. 

On which day will the snail finally reach the top of the wall?

1. Two identical squares, each with an area of 100cm2, are placed so that the corner of one square lies exactly at the center point of the other square. 

What is the area of the overlapping region?

1. A farmer wants to build a straight fence that is 100 metres long. He places a wooden post every 10 metres, including one at the very beginning and one at the very end. 

How many posts does he need in total?

1. A standard recipe for concrete uses a ratio of 1 part cement : 2 parts sand : 3 parts gravel. If a builder has a 25 kg bag of cement and wants to use all of it, what is the total weight of the concrete mix once the sand and gravel are added?

   
   

2. A regular polygon has interior angles that each measure 140°. How many sides does this polygon have? (Hint: Use the exterior angle rule! The exterior angle and interior angle always add up to 180°).