Answer:
Lyla used 1.4-1 = 0.4 = 40% more brown sugar than white sugar
Explanation:
To find how much brown sugar she used, we divide the amount she used of brown sugar divided by the amount she used of white sugar.
7/10 of a scoop of brown sugar
1/2 of a scoop of white sugar.
So

Lyla used 1.4-1 = 0.4 = 40% more brown sugar than white sugar