How to find Value of a Variable from given set of equations

Please help on how to solve this Problem:

Where need to find out Values of A, As, A1 & A2.

25-Diamond I

Define Z, provide guess values for all four variables you wish to solve for and use Find(...) at the end of the solve block.

Why don't you just use the first and last equation, solve for A1 and A1 and calculate A and As afterwards?

P.S.: You didn't expect us to retype your pic, didn't you?

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