1 answer:
Create a ratio and cross multiply
20x - 75 = 14x + 63
6x = 138
x=23
hope this helps :)
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There are 3 slots
7 autos for 1st slot
6 for 2nd (1 went to 1st slot)
5 for 3rd
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The Anwser to 29-40 is -11
