What's the scientific notion of : 545 0,7 71 000 0,008
0,00028 ×10³ 1 789 ×10² 10 235×10(9) 0,57 × 10(4)

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.

x = 1/2

step-by-step explanation:

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