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Alex can drive for 100 miles. First you do 30 - 18, which is 12. Divide 12 by 0.12 to get your answer, which is 100 miles. 

Hope this answer helped!

Alex would drive for 100 miles

The calculation is one as follows;

Alex rents a car for one day

The charge for the car is $18 plus $0.12 per mile

Alex wants to spend $30

The number of miles he will drive can be calculated as follows

= $30 - $18

= $12

= 12÷0.12

= 100

Hence if Alex spends $30 he will drive for 100 miles

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