Bad hair day

Large brown wall display rack containing a grid pattern of small tubes of hair colour. The rack is 16 units across and 8 units down. The tubes are randomly scattered throughout the rack, and are made up of tubes of four main colours: red (30 tubes), blonde (11 tubes), brown (31 tubes) and black (39 tubes). A small number of the spaces are empty.


How many cans of hair colour are there?

How many cans need to be replaced?

How might you estimate the total number of cans?

Which colour (blonde, bronze, red or black) appears to be most popular in this salon?

How would you explain to someone how to locate a particular can on the shelves?

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