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Difficulty: Fun

Mariana the astronaut weighs 51 kilograms on Earth and 8.5 kilograms on the Moon. Mariana is training Javier to go to the Moon. If he weighs 78 kilograms on Earth, how much will he weigh on the Moon?

Scroll down or click for a hint, or the answer!


 

Brainteaser hint

What’s the ratio between Earth and Moon weights? You can use a fraction or a percentage.

Brainteaser answer

Javier will weigh 13 kilograms on the Moon.
The ratio between Earth weight and Moon weight will stay the same. Find this ratio using Mariana’s stats:

8.5 ÷ 51 = 1/6 or 16.7%

The Moon’s gravity, at the surface, is only one sixth of what we feel here on Earth!

To find Javier’s Moon weight, we can multiply his Earth weight by the ratio:

78 x 1/6 = 13 kilograms