A group of students were asked about their siblings. The two categories show if they have at least one brother, and if they have at least one sister.
How many of the students have at least one sibling?
How many of the students have at least one brother?
How many of the students don't have a sister?
A student creates the following diagram of their favourite animals.
A jeweller has arranged his gems based on the cut and colour of the gem:
Cuts - triangular , rectangular , and octagonal
Colours - amethysts , emeralds , and rubies
A jeweller has arranged his gems based on the cut and colour of the gem:
Cuts - triangular , rectangular , and octagonal
Colours - amethysts , emeralds , and rubies