First let's define variables:
r: reading
s: skimming
We write the system of equations that adapts to the problem:
r + s = 275
(15/10) r + (10/15) s = 355
We solve the system of equations:
r = 206
s = 69
Note: see attached image for system solution.
Answer:
Jayden had to skim 69 pages through
First we have to find the areas of both circle using the formula

For larger circle,

For smaller circle,

Required probability

Correct option is the second option .
Answer:
the distance is 3/4
Step-by-step explanation:
If you have any questions about the way I solved it, don't hesitate to ask me in the comments below :)