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90% of runners who started a marathon completed it. Of those, 30% are men. If 270 men completed the marathon, then how many total runners started the marathon?

The Fact

You can cut a cake into eight equal pieces with just 3 cuts. How? Well, first you cut across the middle both horizontally and vertically to divide the cake into 4. Then you simply cut across the cake’s diameter to turn this 4 into 8.

There's two kind of people: who spend a lot of time to save some money and who spend a lot of money to save some time.