a girl scout troop sold cookies. if the girls sold 5 more boxes the second week than they did the first, and if they doubled the
sales of the second week for the third week to sell a total of 431 cookies, how many did they sell each week ?
1 answer:
Answer:
wk. 1 : 104, wk. 2 : 109, wk.3 : 218
Step-by-step explanation:
x = 1st week, y = 2nd week, z = 3rd week
x + y + z = 431
y = x + 5.........y - 5 = x
z = 2y
(y - 5) + y + 2y = 431
4y - 5 = 431
4y = 431 + 5
4y = 436
y = 436/4
y = 109 <==== week 2
z = 2y
z = 2(109)
z = 218 <==== week 3
x = y - 5
x = 109 - 5
x = 104 <==== week 1
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