An elevator can carry at most 150 kg on each trip. Four friends weigh 60 kg, 80 kg, 80 kg and 80 kg. How many elevator rides are needed to take all of them upstairs, if none wants to use the stairs?
Ten bags contain different whole numbers of sweets from 1 to 10. Five children each take two bags. Alex gets 5 sweets, Bob 7, Charles 9 and Dennis 15. How many sweets does Eric get?
Ruby was born 52 days before her classmate Izzy. This year Ruby celebrates her birthday on Tuesday. On which day of the week will Izzy celebrate her birthday?
In the neighbouring orange orchard, another swarm of bees is building a triangular nest. On the first day, they build 1 cell. On the second day, they add 9 cells. If the pattern continues, how many hexagonal cells will they have built on the fourth day?
Five ladybirds are shown below.
Two ladybirds are friends if their total numbers of spots differ by exactly 1. On Kangaroo Day, each ladybird sends one message to every friend. How many messages are sent?
A square is divided into four smaller squares. Each small square is coloured grey or black, as in the examples below.
How many colourings are possible?
In March, Mr Harry buys Marco the horse for 100 dollars. In May he sells him for 200 dollars. In July he misses Marco and buys him back for 400 dollars. In September a circus buys Marco for 700 dollars. How many dollars has Mr Harry gained or lost?
Remy the mouse is looking for food. He stands between a piece of cheese and an apple, which are 64 cm apart. His distance to the apple is 3/5 of his distance to the cheese. Which food is nearer, and how far away is it?
In K × (A + N + G + A + R + O + O), different letters stand for different nonzero digits, and repeated letters stand for the same digit. Find the smallest possible value.
An artist has 14 cubes, each with an edge length of 1 metre. She arranges them on the floor as shown, then paints the surface she can see. How many square metres does she paint?
A row in a garden has 20 flowers, coloured orange, yellow, red, orange, yellow, red, … . Each flower carries a ladybird, bee, fly or butterfly. If the first eight flowers look as shown, how many bees are on orange flowers?