4 times 7 = 28
3 times 7 = 21
It will take him 21 days to make 28 bird houses.
Since only one person can finish in first place, one in second, etc., the total number of placers is 12x11x10, or 1320 different ways the 12 racers can finish 1st, 2nd and 3rd....
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180537.5 simplified is 180538
Answer:

Step-by-step explanation:
We translate the phrase into an equation:

Then we simplify:
