exam Maths Puzzle Numerical Ability

log base2 3x + log base2 3 = log base 2 (2x+15)

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exam Other Question

(3x -9)/(4x +20) . (x� +3x -10)/(6x� -12x) What rate of interest, to the nearest tenth of a percent, compounded quarterly is needed for an investment of $1500 to grow to $2700 in 10 years?