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This problem trains for: SAT-I, GMAT, AMC-8, Math Kangaroo 3-4, Math Kangaroo 5-6.
40% of the iron meteorites that fall on Earth are 95% of the meteorites that originate outside the Solar System (in deep space). What is the ratio between the number of deep space meteorites and the number of iron meteorites?
Let us denote the number of iron meteorites by I and the number of deep space meteorites by D. Then:
Where from we can get the ratio D:I