exam Maths Puzzle Numerical Ability

x+4 - 2x+3
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x^2-x-2 - x^2+2x-8

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exam Other Question

9^x -3^x+1 =0 Karl determined that the ratio of trucks to cars sold at his car dealership last month was 3 to 7. If a total of 210 trucks and cars were sold last month, how many cars were sold?