Answer:
The no. of boxes sold in first week , second week and third week are 104 , 109 and 218 respectively.
Step-by-step explanation:
Let x be the no. of boxes sold in first week .
We are given that the girls sold 5 more boxes the second week than the first
No. of boxes sold in second week = x+5
They doubted the sales of the sales of the second week for for the third week
No. of boxes sold in third week = 2(x+5)
She sold a total of 431 boxes of cookies
So, x+x+5+2(x+5)=431
x+x+5+2x+10=431
4x+15=431
4x=431-15
4x=416
x=104
The no. of boxes sold in first week is 104
No. of boxes sold in second week = x+5 =104+5=109
No. of boxes sold in third week = 2(x+5) =2(104+5)=218
Hence The no. of boxes sold in first week , second week and third week are 104 , 109 and 218 respectively.
