Answer:
9
Step-by-step explanation:
Let's say Mark is M and his brother is B.
M+5=B
M+B=23
Now we can solve using subsitution.
M+M+5=23
(Subtract 5 from both sides)
2M=18
M=9
Hope this helped!
Add all the sides together
7.2+14.8+16.1+18 = 56.1
15 gggggggggggggggggggggg
Answer:
10t+3
Step-by-step explanation: