Question 739983
F-S=30 OR F=30+S
F+12=3(S+12)
F+12=3S+36
30+S+12=3S+36
S-3S=36-30-12
-2S=-6
S=-6/-2
S=3 YEARS OLD NOW.
F-3=30
F=30+3
F=33 YEARS OLD NOW.
PROOF:
33+12=3(3+12)
45=3*15
45=45