Question 256930
W-William's age
F-His father's age
M-Mary's age
"is" means equals.
1.{{{W=(1/6)F}}}
2.{{{W=5+M}}}
3.{{{W+F+M=51}}}
Find F and M as a function of only W using eq. 1 and eq. 2, then substitute those in eq. 3 to solve for W.