SAT Question of the Day June 12 2013
A geologist has rocks of equal weight. If rocks and a -ounce weight balance on a scale with rocks and a -ounce weight, what is the weight, in ounces, of one of these rocks?
All we need to do is to set an equation – one rock will weigh X ounces.
It is clear we have two more rocks on one side and 12 ounce more on the other.
This implies each rock weighs 6 ounces.
71% out of 128,000 got it right – indeed a relatively simple question.