exam Maths Puzzle Numerical Ability

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27(3^3x+1) = 3

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Carla invested $20,000, part at 6% and part at 15%. If the total interest at the end of the year is $1,290, how much did she invest at 6%? How many miles dis Msr. McCarthy travel if she drove30 miles per hour for 3/4 hour and 55 miles per hour for 1 1/2 hours?