Can anyone help me with this geometry proof

m∠3 = 57° → proved down

Step-by-step explanation:

The given is:

We want to prove that m∠3 = 57°

∵   // and is the transversal → given

∴ m∠1 = m∠2 → corresponding angles

∵ m∠1 = 123° → given

∴ m∠2 = 123° → equality of two corresponding angles

∵ // and is the transversal → given

∴ m∠2 + m∠3 = 180° → interior supplementary angles  

∵ m∠2 = 123° → proved

∴ 123 + m∠3 = 180 → subtract 123 from both sides

∴ m∠3 = 57° → inverse addition property

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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.