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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?

### A.

### B.

### C.

### D.

### E.

### All we need to do is to set an equation – one rock will weigh X ounces.

### 6X+10=4X+22

### 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.

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