If we know that Sophie already has $14 saved up and that she plans to save $5 each week, we can find out how many weeks until she can get her jacket.
$14 already saved up
14 + 5 = $19 → first week
19 + 5 = $24 → second week
24 + 5 = $29 → third week
29 + 5 = $34 → fourth week
34 + 5 = $39 → fifth week
39 + 5 = $44 → sixth week
44 + 5 = $49 → seventh week
49 + 5 = $54 → eighth week
54 + 5 = $59 → ninth week
59 + 5 = $64 → tenth week
Therefore, it will take Sophie 10 weeks to save up enough money for her new jacket.