Question

A star has a size of 0.1 solar radius. How many times larger is the sun than this star?

Answer 1

For this case, the first thing we are going to do is define variables:
x: size of the radius of the star
Y: size of the solar radio.
Let's write an equation that models the problem:
a star has a size of 0.1 solar radius:

`x = 0.1y`
Clearing y we have:

`y = x / 0.1`
Rewriting we have:

`y = x / (1/10) y = 10x`
Answer:
the sun is 10 times larger than this star