If PQ = 3x + 4 and the perimeter of triangle PQR = 57, find
the value of x.

can you give me more detail on this! ?

step-by-step explanation:

step-by-step explanation:

the first 5 right here the next 5 i will upload as separate question

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let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.