exam Maths Puzzle Numerical Ability

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?

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exam Other Question
How many pounds of seed worth $0.60 a pound must be mixed with 300 pounds of seed worth$0.35 a pound to produce a mixture worth $0.50 per pound?
______lbs. of $0.60 a pound seed. f(x)=5x^-3x+1, find f(-2)



5(-2)^-3(-2)+1
10^+6+1
20+7=27

Just double checking my answers.