Kellie and Liam cycle on a track 300 m around. Kellie rides three laps in 100 seconds; Liam rides five laps in 200 seconds. Who is slower, and what is that cyclist’s speed?
The first group contains 1 square, the second 5 squares and the third 14 squares. Continue the pattern: how many squares of all sizes are in the fourth group?
Leo folds a square sheet in half twice and cuts out the tilted rectangle shown, cutting through every layer. How many separate pieces does he obtain when the paper is unfolded? Count the cut-out pieces too.
Greg has 100 identical 4 cm by 2 cm rectangles. He arranges them as shown: each rectangle’s top-left vertex is at the midpoint of the preceding rectangle’s bottom edge. Find the perimeter of the final figure.
Uncle John has three nieces, Abby, Bella and Cindy. Abby is two years older than Bella and two years younger than Cindy. Uncle John’s age equals the sum of their ages. Which listed age can be his?
Intended age convention: all ages are whole numbers of years.
Five locks have the letter passwords shown; each occurrence of a letter stands for the same digit. The five matching keys are mixed up, and one numerical label is missing. Find the missing label.
Harry and Ron each join six identical rectangles into the shapes shown. Harry’s perimeter is 32 cm less than Ron’s. Find the perimeter of one small rectangle.
A box contains 100 balls numbered 1 through 100, one of each. What is the least number drawn without replacement that guarantees two balls whose numbers sum to 100?
A car leaves a gas station for the airport at 60 km/h. A truck leaves the same station 10 minutes later in the same direction at constant speed. The truck catches the car 1 hour 40 minutes after its own departure. Find the truck’s speed.
Farmer Ben has seven fruit trees with the initial fruit counts shown. Each day he visits only one tree and collects at most 10 fruits; he may revisit trees. After three weeks, what is the smallest possible total number of fruits left? Treat the initial fruit inventory as fixed, with no new growth or other loss.