What we want to do first is isolate the variable. To do this we need to multiply each side by 5 to remove the fraction
5 * 5 = 5*

w
Simplify the right side
5 *

w = 1w
Now simplify the left side
5 * 5 = 25
Then we get...
25 = w
There's your answer!
I think the answer would be the 0.039.
0.625 day to grow 1 cm.
16/10 = 1.6 cm in day.
I hope that help ✌️