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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I have a mathematical modeling problem that I am having trouble solving. Please help.
When buying or selling stock for a customer, the Mark Hodge Agency charges $40 plus 8 cents p Simplify:

3 sq root 32 - 5 sq root 50 - 8 sq root 45 + 7 sq root 20