An average Australian household makes about one-fifth of all Australia’s greenhouse gases by using their car, using electricity at home and through the breakdown of household waste in rubbish dumps.
A coin collector had three pennies that looked exactly the same. However, one was a fake and weighed less than the other two. While she was looking at them, she got confused and forgot which coin was the fake.
The only scales she had were a pair of balance scales with two trays. The machine can help determine which tray is heavier, or if they balance. The coin collector thought for a while and realised she could work out the fake with only one weighing.
How did she find the fake?
Wanna know the answer?