Answer:
5 hours
Step-by-step explanation:
16+3x=31
-16 -16
3x=15
15/3=5
x=5
Sara is now 4, will be 8 in 4 years. Ralph is now 12, will be 16 in 4 years.
The first one
Whitxh answer are u tryna get?
1 and 5