Answer:
An expression is a number, or a variable, or a combination of numbers and variables and operation symbols.
Now it is given that,
Amount in Arie's account = $46
Arie's each week savings = $8.50
Amount in Olga 's account = $14
Olga 's each week savings = $12.50
Let x be the number of weeks when Arie and Olga will have the same amount in their accounts
Total savings of Arie = 8.5x
Total savings of Olga = 12.5x
Amount in Arie's account = 8.5x + 46
Amount in Olga's account = 12.5x + 14
For, Arie and Olga have the same amount in their accounts
8.5x + 46 = 12.5x + 14
Taking alike terms together,
12.5x - 8.5x = 46 - 14
⇒ 4x = 32
Dividing both side by 4 we get,
x =8 weeks
which is the required number of weeks.
Thus, Arie and Olga will have the same amount in their accounts in 8 weeks.