T1W3 TS Q01 – Selective High School

Australia is home to some of the largest bird species in the world.

The brolga has been known to grow up to 1.5 metres and weigh up to 8 kilograms.

The pelican has been known to grow up to 1.8 metres and weigh up to 13 kilograms.

The cassowary has been known to grow up to 1.8 metres and weigh up to 55 kilograms.

The emu has been known to grow up to 1.9 metres and weigh up to 60 kilograms.

If the above statements are true, which one of the below sentences must also be true?

If you see a bird bigger than 1.8 metres and weighing more than 55 kilograms, you must be in Australia. A bird that is larger than 1.5 metres and weighing more than 50 kilograms must be an Australian bird. An Australian bird larger than 1.8 metres and weighing more than 50kg must be an emu. If an Australian bird is smaller than 1.9 metres and weighs less than 60 kilograms, it must be a cassowary.

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If the above statements are true, which one of the below sentences must also be true?