Question

Solve this problem on paper using all four steps.

Answer 1

Answer:they sold

1st week: 104

2nd week: 109

3rd week: 218

Answer 2

Your mistake is that week 3 is twice of week 2
week2=x+5, twice of that is 2(x+5)=2x+10, you did not distribute the 2 to the 5 and you got 2x+5, that is your mistake


x is first week
2nd week is y
3rd is z

5 more the 2nd week than 1st week
x+5=y

3rd week is double 2nd wee
z=2y

total is 431

x+y+z=431
sub
y=5+x and z=2y
x+5+x+2y=431
sub 5+x for y
x+5+x+2(5+x)=431
x+5+x+10+2x=431
4x+15=431
minus 15
4x=416
divide by 4
x=104
add 4
x+5=109
double
2*109=218

they sold
1st week: 104
2nd week: 109
3rd week: 218