Question 173429
lets call the number of cookies sold in week 1,2 and 3: a,b,and c respectively
:
b=a+5.......eq 1---->a=b-5 revised eq 1
c=2b........eq 2
a+b+c=431...eq 3
:
lets take the value of a from revised eq 1 and the value of c in eq 2 and plug them into eq 3
:
(b-5)+b+(2b)=431
:
4b-5=431....combining b terms
:
4b=436.....combining constants
:
{{{highlight(b=109)}}}..........................boxes of cookies sold 2nd week
:
using revised eq 1 {{{highlight(a=b-5=109-5=104)}}}boxes of cookies sold week 1
:
using eq 2{{{highlight(c=2b=2(109)=218)}}}.........boxes of cookies sold week 3