To find the value of s in the equation 3r + 10 = 5s given that r = 10, we will substitute the value of r into the equation and solve for s.
Starting with the equation:
3r + 10 = 5s
Substituting r with 10:
3(10) + 10 = 5s
This simplifies to:
30 + 10 = 5s
Which further simplifies to:
40 = 5s
Now, to isolate s, we can divide both sides of the equation by 5:
s = 40 / 5
This gives us:
s = 8
So, the value of s when r is 10 is 8.