Tap a fruit, then its weight.
Your record
How to play Fruit Scales
- 1
Every scale balances. The fruit on the left pan weighs exactly the same as everything on the right pan.
- 2
Find a scale to start from. Look for a scale with only one kind of fruit on it. Three bananas weigh 15, so one banana weighs 5.
- 3
Use what you know. Put that weight into the other scales. A banana and a pear weigh 12, so the pear is 12 − 5 = 7.
- 4
Weigh it. Set a number on every fruit and press Weigh. A scale that tips shows which side your numbers make too heavy. Solve it in one weigh for a green bar.
Hard puzzles: sometimes no scale has just one kind of fruit. Then compare two scales. If an apple and two kiwis weigh 13, and an apple and one kiwi weigh 9, the only difference is one kiwi, so a kiwi weighs 4.
Questions
Is it the same puzzle for everyone?
Yes. Everyone gets the same three puzzles each day, easy, medium and hard, so you can compare how many weighs you needed.
What age is it for?
From about 8. The easy puzzle needs adding and halving. The hard one is a proper brain teaser for teenagers and grown-ups, and a nice way to show children what algebra is about.
Is there always one answer?
Always. Every fruit weighs a whole number, and each puzzle has exactly as many independent scales as fruits, so only one set of weights balances them all. No guessing is needed.
How do levels work?
There are more than 500 numbered levels. They start with two fruits and grow to five, with fruit on both sides of the scale. Your progress is saved on this device.
Why are there no units?
The numbers on the iron weights are just weights. Call them kilograms if you like, but a 9 kg cherry would be quite a cherry.