book Maths Puzzle Numerical Ability

10+x=18

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Jim rode his bike to school at an average rate of 8mp. On his return trip home, he averaged 6mph. If the total trip took 7 hours, how far is it from home to school I need to represent each quantity with a real number. Here is the problem:
A country exported $60,000,000 less than it imported creating a negative trade balance.