Five groups plant trees in the school garden. Their totals are represented in the pictograph. How many more trees does Fermat group plant than Pascal group?
Eve waits for Amy at Fermat bus stop. The first bus arrives at 8:30, then buses arrive every 25 minutes. Amy is on the fourth bus. At what time does it arrive?
Cutting one rope into three sections takes 12 seconds. Each cut takes the same time. How many seconds are needed to cut three ropes into six sections each? The ropes cannot be bundled together.
Ben is tiling a rectangular floor so that tiles of the same kind do not share an edge. He has used all his tiles to make the arrangement shown. Each yellow tile costs 2 dollars and each grey tile costs 5 dollars. What is the least cost of the additional tiles needed?