exam Maths Puzzle Numerical Ability

if x+2y+3z=53 and 3x+2y+z=52 what is the value of x+y+z?

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Please help w/ the following. Thank You.

If 10,000 is invested at 9% compounded monthly for 6 years the compounded amount is given by A=10,000(1.0075)^72. Given that log 1.0075=0.00325, find log A. (Note that 10,000=10^4). f(t)= log(t-5)