Answer:
Lauren will get $640 and Cara will get $560.
Explanation:
Given that:
Age of Lauren = 16 
Age of Cara = 14 
Ratio = 16 : 14
Amount given by their grandad = $1200
Let, 
x be the number of times.
16x + 14x = 1200 
30x = 1200
Dividing both sides by 30 

Share of Lauren = 16x = 16*40 = $640 
Share of Cara = 14x = 14*40 = $560
Hence,
Lauren will get $640 and Cara will get $560.