Erin and jamie are collecting shells while the tide is out. erin has 27 shells, and she has 9 more than jamie. write and equation for this situation and find how many shells jamie has collected. a. 27 = j + 9; jamie collected 18 shells b. 27 = j – 9; jamie collected 36 shells c. 27 + 9 = j; jamie collected 36 shells d. 27 = j + 9; jamie collected 36 shells

A.

Erin's total minus 9 gives us Jamie's total. This means Erin's total equals Jamie's total plus 9. This leads us to the conclusion that 27 (E's total) = j + 9 (the difference). We also know from the first phrase that E - 9 = j, meaning 27 - 9 = j, so j = 18.

answer:

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step-by-step explanation:

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.