exam Maths Puzzle Numerical Ability

I have tried to figure this one out can you help? #82. Venture capital. Henry invested $12,000 in a new restaurant. When the restaurant was sold 2 years later, he received $27,000.

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exam Other Question

logarithmic equations
log(x+10)-log(x+4)=log x
Solve the system by any method


{x=9/2+5
2x-9y=10