Jack earned $ 172,874 in 6 months. On an average, about how much did he earn each month? Choose the best estimate. $25,000$25 comma 000 $30,000$30 comma 000 $17,000$17 comma 000 $20,000$20 comma 000

$30,000

Step-by-step explanation:

Jake earned $172,874 in 6 months.

The average he earned would be the amount earned in total divided by the number of months it took to earn that amount:

Average per month = Amount / number of months

= 172,874 / 6

= $28,812.33 per month

= $30,000 to the nearest ten thousand.

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.