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Solve the problems in the reverse order, from the end to the beginning:
1.  Subtract the product of 4 and 3 from 24.  You will get  24 - 3*4 = 24 - 12 = 12.
2.  Divide 12 by 3. You will get 12 : 3 = 4.
Answer.  The number is 4.