Answer:
r = 11
Step-by-step explanation:
mDG and mGM must add up to mDM
Step 1: Set up equation
mDG + mGM = mDM
r + 5 + 3r - 14 = 35
Step 2: Solve for r
Combine like terms: 4r - 9 = 35
Add 9 to both sides: 4r = 44
Divide both sides by 4: r = 11
11
[tex]r+5+3r-14=35\\4r-9=35\\4r=44\\r=11[/tex]
