Well in my calculations I got: well if you he increases the speed by 2.6 per hour soo 4+2.6=6.6
15 goes into 18 once with 3 remainder.
18/15-15/15=3/15=1/5
So the answer is:
I believe the phi ratio^2 = 1 + phi ratio
phi ratio = 1.6180339
phi ratio^2 = 2.6180339
Theres an app called photomath that could easily solve problems like this
Answer:
first one and the biology one