Answer:
3/8
Explanation:
The values of ABC that make 2×ABC = 750 are ABC=375.
The fraction 0.375 is the decimal equivalent of 3/8.
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This decimal equivalent is something you memorized in 4th grade. If not, you can always reduce the fraction 375/1000 by removing 3 factors of 5:
... 375/1000 = 75/200 = 15/40 = 3/8